Differential pressure type flowmeter facilitating exhaust at pressure tapping position

Abstract

The differential pressure type flowmeter comprises a throttling element, a pressure tapping part, measuring pipes and mounting parts, the measuring pipes are arranged at the mounting parts at the two ends of the measuring pipes, the throttling element is arranged in the measuring pipes, the pressure tapping part is connected to the upper portions of the measuring pipes, and the pressure tapping part is connected to the lower portions of the measuring pipes. The pressure tapping part comprises a high-pressure side pressure tapping part and a low-pressure side pressure tapping part, the high-pressure side pressure tapping part and the low-pressure side pressure tapping part are arranged on the two sides of the throttling element in the medium flow direction respectively, the axial included angle between the high-pressure side pressure tapping part and the measuring pipe in the medium flow direction and the axial included angle between the low-pressure side pressure tapping part and the measuring pipe in the medium flow direction are smaller than 90 degrees, and the highest end of each pressure tapping part is connected with an exhaust guide pipe. According to the differential pressure type flowmeter facilitating exhaust at the pressure tapping position, the exhaust port is additionally formed in the pressure tapping flange, the pressure tapping flange is designed to be obliquely installed relative to the main pipe, exhaust is better facilitated, and the problems that in the prior art, when a liquid measuring pressure tapping flange is vertically and upwards installed, gas in a pressure tapping pipeline cannot be exhausted, and the measuring precision and the flow stability are affected are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of flow meters, in particular to a differential pressure flow meter which is convenient for exhausting air at a pressure taking location. Background Art

[0002] The differential pressure flowmeter is usually composed of a throttling device, a pressure taking device and a differential pressure conversion instrument. Installing a throttling device inside a pipe filled with fluid will cause the fluid to form a local contraction at the throttling point, thereby increasing the flow rate, reducing the outlet pressure, and changing the pressure before and after the throttling device. The local pressure is detected by the pressure taking device, and the flow parameters are obtained by analyzing the direct relationship between the pressure difference and the flow rate.

[0003] For the measurement of the flow of media containing particles and erosion and abrasion, the structure of the flow meter currently used is generally: a pressure flange perpendicular to the pipe wall is installed on the upper part of the measuring pipe wall, and the gas generated during the flow of the medium is discharged to the outside through the pressure flange perpendicular to the pipe wall. Although this type of flow meter can meet the basic requirements of gas discharge, it can improve the stability of the medium flow and the accuracy of flow measurement.

[0004] However, currently the pressure taking device is installed vertically upward, the pressure taking exhaust pipe is perpendicular to the pressure taking flange, and the gas inside the pressure taking device is retained on the horizontal flange surface, which affects the measurement accuracy and flow stability of the medium flow. Utility Model Content

[0005] The utility model aims to solve the problem in the prior art that when the pressure-taking exhaust pipe is perpendicular to the pressure-taking flange, gas is retained on the horizontal flange surface, which affects the measurement accuracy and flow stability of the medium flow.

[0006] In order to achieve the above-mentioned purpose, the present application proposes a differential pressure flowmeter which is convenient for exhausting gas at the pressure taking point, comprising: a throttling device, a pressure taking part, a measuring tube and a mounting part, the measuring tube is arranged at the mounting parts at both ends of the measuring tube, the throttling device is arranged inside the measuring tube, the pressure taking part is connected to the upper part of the measuring tube, the pressure taking part comprises a high-pressure side pressure taking part and a low-pressure side pressure taking part, the high-pressure side pressure taking part and the low-pressure side pressure taking part are respectively arranged on both sides of the throttling device along the flow direction of the medium, the high-pressure side pressure taking part and the low-pressure side pressure taking part both have an axial angle of less than 90° with the measuring tube along the flow direction of the medium, and the highest end of each of the pressure taking parts is connected to the exhaust duct.

[0007] The differential pressure flowmeter for facilitating exhaust at the pressure taking point of the present application adds an exhaust port to the pressure taking flange, and designs the pressure taking flange to be installed at an angle with the main pipe to facilitate exhaust, thereby solving the problem in the prior art that when the liquid pressure taking flange is installed vertically upward, the gas in the pressure taking pipeline cannot be discharged, affecting the measurement accuracy and flow stability.

[0008] As an improvement of the above-mentioned pressure taking part of the present application, the pressure taking part includes: a pressure taking tube connected to the measuring tube, and a pressure taking flange connected to the pressure taking tube.

[0009] The pressure pipe is used to take pressure from the high-pressure side and the low-pressure side of the measuring pipe, and the pressure flange is used to connect the differential pressure transmitter.

[0010] As an improvement of the above-mentioned exhaust duct of the present application, the exhaust duct comprises: a gas collecting section, a gas guiding section and an exhaust section, wherein one end of the gas collecting section is connected to the highest point of the pressure taking part, the other end of the gas collecting section is connected to the gas guiding section, the gas guiding section is connected to the exhaust section, and an exhaust valve is provided on the exhaust section. The gas at the highest point of the pressure taking part can be discharged through the gas collecting section, the gas guiding section and the exhaust section.

[0011] Furthermore, the gas collecting section and the gas guiding section are arranged inside the pressure taking flange, and the gas exhaust section is arranged outside the flange. Since the gas in the pressure taking part is mainly concentrated at the highest point inside the pressure flange, arranging the gas collecting section and the gas guiding section inside the pressure taking flange is beneficial to the collection and exhaust of the gas and can also save space.

[0012] As a further improvement of the exhaust duct of the present application, the gas collecting section of the exhaust duct is arranged to be tilted downward, the gas guiding section and the exhaust section are arranged to be tilted upward, and the height of the exhaust section is higher than the highest end of the pressure flange. This arrangement facilitates the processing of the exhaust duct.

[0013] As an improvement of the above-mentioned measuring tube of the present application, the measuring tube consists of a high-pressure section and a low-pressure section, and the high-pressure section and the low-pressure section are connected by a clamping flange.

[0014] As an improvement of the above-mentioned throttling device of the present application, the throttling device is an annular wedge throttling device, and the throttling device includes a throttling block and a mounting plate, and the mounting plate is arranged between the clamping flanges of the high-pressure section and the low-pressure section.

[0015] The measuring tube of the present application consists of a high-pressure section and a low-pressure section, and the throttling device is installed between the clamping flanges of the high-pressure section and the low-pressure section, so that the throttling device can be removed separately. When the measurement accuracy of the flow meter is reduced due to the wear of the medium, only the throttling device can be replaced, thereby reducing the overall replacement cost.

[0016] Furthermore, a sealing gasket is arranged between the mounting plate and the clamping flange.

[0017] Furthermore, the clamping flange is fixed by fasteners.

[0018] Furthermore, the throttling surface of the throttling member is coated with a hardened coating.

[0019] The hardened coating can increase the surface strength of the throttling element and prevent the throttling element from being damaged by the impact of the medium containing particles, erosion and wear.

[0020] The beneficial effects of this application are:

[0021] 1. The differential pressure flowmeter for facilitating exhaust at the pressure taking point of the present application adds an exhaust port to the pressure taking flange, and designs the pressure taking flange to be installed at an angle to the main pipe for better exhaust. The gas in the fluid flow process will first gather at the upper part of the measuring tube, and then flow to the upper part of the pressure taking flange. Since the high-pressure side pressure taking flange and the low-pressure side pressure taking flange form a certain angle with the measuring tube, the gas will gather at the highest position, and an exhaust duct and an exhaust valve are installed at the highest position, thereby greatly improving the exhaust efficiency and exhaust volume; thereby solving the problem that when the liquid pressure taking flange is installed vertically upward in the prior art, the gas in the pressure taking pipeline cannot be discharged, affecting the measurement accuracy and flow stability.

[0022] 2. The measuring tube of the present application consists of a high-pressure section and a low-pressure section. The throttling device is installed between the clamping flanges of the high-pressure section and the low-pressure section, and the clamping flanges of the throttling device are fixed by fasteners, so that the throttling device can be removed separately. When the measurement accuracy of the flow meter is reduced due to the wear of the medium, only the throttling device can be replaced, thereby reducing the overall replacement cost.

[0023] 3. When measuring high-viscosity fluids, installing the flow meter on an inclined pressure-taking part is more conducive to the viscous medium falling off the transmitter diaphragm and improving the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is a structural schematic diagram of a differential pressure flow meter that facilitates exhaust at the pressure taking location in an embodiment of the present application;

[0026] Figure 2 It is a left view of a differential pressure flow meter that is convenient for exhausting the pressure taking place in an embodiment of the present application;

[0027] Figure 3 for Figure 1 The enlarged image at a in the middle;

[0028] Description of reference numerals:

[0029] 1. Installation department;

[0030] 2. Measuring tube; 21. High pressure section; 22. Low pressure section;

[0031] 3. Pressure taking part; 301. Pressure taking pipe; 302. Pressure taking flange; 31. High-pressure side pressure taking part; 32. Low-pressure side pressure taking part;

[0032] 4. Clamping flange; 41. Sealing gasket; 42. Fastener;

[0033] 5. throttling element; 51. throttling block; 52. mounting plate;

[0034] 6. Exhaust duct; 61. Gas collecting section; 62. Gas guiding section; 63. Exhaust section; 64. Exhaust valve. DETAILED DESCRIPTION

[0035] The following will be combined with the attached Figures 1 to 3 The embodiments of the technical solution of the present application are described in detail. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0036] like Figures 1-2 The present application illustrates a differential pressure flow meter that is convenient for exhausting gas at the pressure taking point. The differential pressure flow meter that is convenient for exhausting gas at the pressure taking point includes: a measuring tube 2, a mounting part 1, a pressure taking part 3, and a throttling device 5. The mounting part 1 is arranged at both ends of the measuring tube 2, the throttling device 5 is arranged inside the measuring tube 2, the pressure taking part 3 is connected to the upper part of the measuring tube 2, the pressure taking part 3 includes a high-pressure side pressure taking part 31 and a low-pressure side pressure taking part 32, the high-pressure side pressure taking part 31 and the low-pressure side pressure taking part 32 are respectively arranged on both sides of the throttling device 5 along the flow direction of the medium, the high-pressure side pressure taking part 31 and the low-pressure side pressure taking part 32 are both axially angled with the measuring tube 2 along the flow direction of the medium <90°, and the highest end of each of the pressure taking parts 3 is connected to the exhaust duct 6.

[0037] In one embodiment of the present application, the measuring tube 2 is used to pass the medium of the flow to be measured, and the mounting part 1 is used to install the differential pressure flowmeter for venting the pressure taking place on the pipeline to be measured. Optionally, the mounting part 1 is a flange, or other components that can realize the installation of the measuring tube 2 on the pipeline to be measured. The throttling device 5 can reduce the flow area of ​​the medium passing through the measuring tube 2, thereby increasing the flow rate of the medium, so that the medium fluid pressure is reduced, so that the medium fluid on both sides of the throttling device 5 forms a differential pressure. The pressure taking part 3 is used to take the differential pressure formed by the medium fluid on both sides of the throttling device 5, so that the differential pressure transmitter measures the differential pressure and converts it into a flow signal.

[0038] In the prior art, the pressure taking device is installed vertically upward, and the pressure taking exhaust pipe is perpendicular to the pressure taking flange. The gas inside the pressure taking device will be retained on the horizontal flange surface, affecting the measurement accuracy and flow stability of the medium flow.

[0039] In this embodiment, since the axial angle between the high-pressure side pressure taking part 31 and the low-pressure side pressure taking part 32 and the measuring tube 2 along the medium flow direction is less than 90°, the highest end of each of the pressure taking parts 3 is connected to the exhaust duct 6. Therefore, in the early stage of measurement, when the fluid passes through the measuring tube, the gas in the high-pressure side pressure taking part 31 and the low-pressure side pressure taking part 32 will be concentrated at the highest point of the high-pressure side pressure taking part 31 and the low-pressure side pressure taking part 32, and can be discharged through the exhaust duct 6. When the airflow in the high-pressure side pressure taking part 31 and the low-pressure side pressure taking part 32 is stable, the exhaust duct 6 is closed, thereby solving the problem that when the liquid pressure taking flange is installed vertically upward in the prior art, the gas in the pressure taking pipeline cannot be discharged, affecting the measurement accuracy and flow stability.

[0040] Continue to refer to Figure 1 In a further embodiment, the pressure taking part 3 comprises: a pressure taking tube 301 connected to the measuring tube 2, and a pressure taking flange 302 connected to the pressure taking tube 301. In this embodiment, the pressure taking tube 301 is used to take pressure on the high pressure side or the low pressure side of the measuring tube 2, and the pressure taking flange 302 is used to connect a differential pressure transmitter.

[0041] Further, continue to refer to Figure 1 , Figure 3 , the exhaust duct 6 includes: a gas collecting section 61, a gas guiding section 62 and an exhaust section 63, wherein one end of the gas collecting section 61 is connected to the highest point of the pressure taking part 3, the other end of the gas collecting section 61 is connected to the gas guiding section 62, the gas guiding section 62 is connected to the exhaust section 63, and the exhaust section 63 is provided with an exhaust valve 64. In this embodiment, the gas collecting section 61 is used to collect the gas accumulated at the highest point inside the pressure taking part 3, the gas guiding section 62 is used to guide the gas accumulated in the gas collecting section 61, and the exhaust section 63 is provided with an exhaust valve 64, and the exhaust valve 64 is used to control the opening of the exhaust duct 6 to discharge or stop the gas at the highest point inside the pressure taking part 3. In the specific implementation process, the exhaust valve 64 can be opened in the early stage of flow measurement, and the exhaust valve 64 can be closed after the air pressure inside the pressure taking part 3 is stabilized, thereby improving the measurement accuracy of the flow meter.

[0042] Further, continue to refer to Figure 1 , Figure 3 The gas collecting section 61 and the gas guiding section 62 are arranged inside the pressure taking flange, and the exhaust section 63 is arranged outside the flange. The gas collecting section 61 of the exhaust duct 6 is arranged to be tilted downward, and the gas guiding section 62 and the exhaust section 63 are arranged to be tilted upward, and the height of the exhaust section 63 is higher than the highest end of the pressure taking flange 302.

[0043] Further, continue to refer to Figure 1 In one embodiment of the present application, the measuring tube 2 is composed of a high-pressure section 21 and a low-pressure section 22, and the high-pressure section 21 and the low-pressure section 22 are connected by a clamping flange 4. The throttle 5 is an annular wedge throttle, and the throttle 5 includes a throttle block 51 and a mounting plate 52, and the mounting plate 52 is arranged between the clamping flanges 4 of the high-pressure section 21 and the low-pressure section 22. The clamping flange 4 is fixed by a fastener 42.

[0044] In this embodiment, the measuring tube 2 is composed of a high-pressure section 21 and a low-pressure section 22, and the throttling element 5 is installed between the clamping flanges 4 of the high-pressure section 21 and the low-pressure section 22, and the clamping flanges 4 of the throttling element 5 are fixed by fasteners 42, so that the throttling element 5 can be removed separately. When the measurement accuracy of the flow meter is reduced due to the wear of the medium, only the throttling element 5 can be replaced, thereby reducing the overall replacement cost.

[0045] Optionally, a sealing gasket 41 is provided between the mounting plate 52 and the clamping flange 4 .

[0046] Optionally, the throttling surface of the throttling element is coated with a hardened coating. When measuring the flow of a medium containing particles, scouring and abrasion, the hardened coating can increase the strength of the surface of the throttling element to prevent the throttling element from being damaged by the impact of the medium containing particles, scouring and abrasion.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A differential pressure flow meter that facilitates exhaust at a pressure point, comprising: A measuring tube (2), mounting portions (1) arranged at both ends of the measuring tube (2), a throttling device (5) arranged inside the measuring tube (2), and a pressure taking portion (3) connected to the upper part of the measuring tube (2), wherein the pressure taking portion (3) comprises a high-pressure side pressure taking portion (31) and a low-pressure side pressure taking portion (32), the high-pressure side pressure taking portion (31) and the low-pressure side pressure taking portion (32) being arranged on both sides of the throttling device (5) along the flow direction of the medium, and characterized in that the axial angle between the high-pressure side pressure taking portion (31) and the low-pressure side pressure taking portion (32) and the measuring tube (2) along the flow direction of the medium is less than 90 degrees, and the highest end of each of the pressure taking portions (3) is connected to an exhaust duct (6).

2. The differential pressure flow meter for facilitating exhaust at the pressure taking point according to claim 1, characterized in that: The pressure taking part (3) comprises: a pressure taking tube (301) connected to the measuring tube (2), and a pressure taking flange (302) connected to the pressure taking tube (301).

3. The differential pressure flow meter for facilitating exhaust at the pressure taking point according to claim 1 or 2, characterized in that: The exhaust duct (6) comprises: a gas collecting section (61), a gas guiding section (62) and an exhaust section (63), wherein one end of the gas collecting section (61) is connected to the highest point of the pressure taking part (3), the other end of the gas collecting section (61) is connected to the gas guiding section (62), the gas guiding section (62) is connected to the exhaust section (63), and the exhaust section (63) is provided with an exhaust valve (64).

4. The differential pressure flow meter for facilitating exhaust at the pressure taking point according to claim 3, characterized in that: The gas collecting section (61) and the gas guiding section (62) are arranged inside the pressure taking flange body, and the gas exhaust section (63) is arranged outside the flange body.

5. The differential pressure flow meter for facilitating exhaust at the pressure taking point according to claim 3, characterized in that: The gas collecting section (61) of the exhaust duct (6) is arranged to be inclined downward, the gas guiding section (62) and the exhaust section (63) are arranged to be inclined upward, and the height of the exhaust section (63) is higher than the highest end of the pressure taking flange (302).

6. The differential pressure flow meter for facilitating exhaust at the pressure taking point according to claim 1, characterized in that: The measuring tube (2) is composed of a high-pressure section (21) and a low-pressure section (22), and the high-pressure section (21) and the low-pressure section (22) are connected via a clamping flange (4).

7. The differential pressure flow meter for facilitating exhaust at the pressure taking point according to claim 6, characterized in that: The throttling member (5) is an annular wedge throttling member, and the throttling member (5) comprises a throttling block (51) and a mounting plate (52), wherein the mounting plate (52) is arranged between the clamping flanges (4) of the high-pressure section (21) and the low-pressure section (22).

8. The differential pressure flow meter for facilitating exhaust at the pressure taking point according to claim 7, characterized in that: A sealing gasket (41) is provided between the mounting plate (52) and the clamping flange (4).

9. The differential pressure flow meter for facilitating exhaust at the pressure taking point according to claim 6, characterized in that: The clamping flange (4) is fixed by a fastener (42).

10. The differential pressure flow meter for facilitating exhaust at the pressure taking point according to claim 1, characterized in that: The throttling surface of the throttling element (5) is coated with a hardened coating.

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