Constant-speed pipe flowmeter with self-cleaning function and working method

Abstract

The invention relates to the technical field of pipeline cleaning flow meters, and particularly discloses a constant-speed pipe flow meter with a self-cleaning function and a working method.The constant-speed pipe flow meter comprises an H-shaped blowing guide pipe assembly, the H-shaped blowing guide pipe assembly comprises a steam pipeline and a nitrogen pipeline, a communicating pipe is connected between the steam pipeline and the nitrogen pipeline, one end of the steam pipeline is connected with a second pressure guide pipe, and the other end of the steam pipeline is connected with a third pressure guide pipe; one end of the nitrogen pipeline is connected with the pressure guide pipe I, and the other end of the nitrogen pipeline is connected with an external nitrogen supply pump; on-off of steam and nitrogen is controlled through the steam valve F3 and the nitrogen valve F4, and online purging and cleaning of the interior of the flowmeter are achieved; according to the medium impurity content in actual production, purging operation is conducted regularly, three modes of steam purging, nitrogen purging and combined purging are provided, it is ensured that the flow meter achieves the self-cleaning function under the conditions that production is not stopped and gas is not stopped, blockage is effectively prevented and cleaned, and the accuracy of flow measurement is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline cleaning flowmeters, and in particular to a uniform-velocity tube flowmeter with a self-cleaning function and a working method thereof. Background Art

[0002] The uniform velocity tube flowmeter is also called the flute-shaped uniform velocity tube flowmeter and the Annubar flowmeter. In this article, they are collectively referred to as uniform velocity tube flowmeters.

[0003] The uniform tube flowmeter uses a long hollow metal rod, which is inserted into the pipe along the pipe diameter and spans the entire pipe diameter. Multiple groups of symmetrical pressure holes are distributed on the flow-facing and back-flow surfaces of the probe rod. The flow rate is calculated by measuring the pressure difference between the flow-facing and back-flow surfaces.

[0004] The cross-sectional area of the probe of the uniform tube flowmeter is small (usually 1% to 5% of the pipe cross section), which hardly increases the energy consumption of the system. The multi-hole averaging design reduces the influence of local turbulence and impurities, and has strong anti-interference ability. While ensuring accuracy, it significantly reduces pressure loss and installation complexity, becoming the preferred solution for large-diameter flow measurement. The structure of the ordinary uniform tube flowmeter is as follows: Figures 3 - 4 shown.

[0005] Due to the structural characteristics of this type of flow meter, when measuring a medium with a lot of impurities, impurities are easily accumulated in the pressure tapping hole, resulting in inaccurate flow measurement. Since the uniform velocity tube needs to be inserted into the pipeline for installation, it cannot be removed and cleaned online after being blocked. The only way is to stop the pipeline from gas and remove it for cleaning. Figure 5 The picture shows a blocked pressure pipe.

[0006] Therefore, it is necessary to design a uniform velocity tube flowmeter with a self-cleaning function and a working method to solve the problem that impurities are easily accumulated in the pressure tapping hole of the existing uniform velocity tube flowmeter and are difficult to clean. Summary of the invention

[0007] In view of the problems existing in the prior art, the object of the present invention is to provide a uniform tube flow meter with a self-cleaning function and a working method.

[0008] The technical solution adopted by the present invention to solve its technical problem is: a uniform tube flowmeter with a self-cleaning function, including an "H"-shaped purge duct assembly, the "H"-shaped purge duct assembly including a steam pipe and a nitrogen pipe, a connecting pipe is connected between the steam pipe and the nitrogen pipe, one end of the steam pipe is connected to a pressure pipe 2, and the other end of the steam pipe is connected to an external steam supply pump, one end of the nitrogen pipe is connected to a pressure pipe 1, and the other end of the nitrogen pipe is connected to an external nitrogen supply pump.

[0009] Specifically, a steam valve F3 is installed on the steam pipeline, and a nitrogen valve F4 is installed on the nitrogen pipeline. The steam valve F3 and the nitrogen valve F4 are located outside the connecting pipe.

[0010] Specifically, a pressure guiding pipe valve F1 is installed on the first pressure guiding pipe, and a pressure guiding pipe valve F2 is installed on the second pressure guiding pipe. The connection between the nitrogen pipeline and the first pressure guiding pipe is located below the pressure guiding pipe valve F1, and the connection between the steam pipeline and the second pressure guiding pipe is located below the pressure guiding pipe valve F2.

[0011] Specifically, both the first pressure guiding pipe and the second pressure guiding pipe are connected to a main pressure guiding pipe. A first flange is provided at the bottom of the main pressure guiding pipe. The first flange is connected to a second flange by bolts. The second flange is provided at the top of a detection rod, and a plurality of pressure tapping holes are provided on the detection rod.

[0012] Specifically, the pressure guiding pipe valve F1, the pressure guiding pipe valve F2, the steam valve F3, and the nitrogen valve F4 are all electrically controlled valves made of high-temperature resistant materials.

[0013] A working method of a constant velocity tube flowmeter with a self-cleaning function includes the following steps:

[0014] S1. Steam purging operation: When the pressure tapping holes or the pressure guiding pipes of the flowmeter are blocked, close the pressure guiding pipe valve F1 and the pressure guiding pipe valve F2 to cut off the medium flow, open the steam valve F3, and introduce high-temperature steam.

[0015] S2. Nitrogen purging operation: Open the nitrogen valve F4 and introduce nitrogen.

[0016] S3. Combined purging mode: In actual operation, select the combined purging mode according to the severity of the blockage. First, introduce steam to soften the impurities, and then introduce nitrogen for strong purging and drying, so that the cleaning effect is more thorough.

[0017] S4. Regular preventive cleaning: According to the content of impurities in the medium, formulate a regular purging plan.

[0018] Specifically, the steam in step S1 enters the static pressure pipe, the total pressure extraction pipe, the detection rod, and the pressure tapping holes of the flowmeter through an "H"-shaped purging duct assembly. Use the high temperature of the steam to soften stubborn impurities such as tar, benzene, and naphthalene. After steam purging for a period of time, close the valve F3 and stop introducing steam.

[0019] Specifically, the nitrogen in step S2 enters the interior of the flowmeter through an "H"-shaped purging duct assembly, purges the static pressure pipe, the total pressure extraction pipe, the detection rod, and the pressure tapping holes, and removes impurities such as dust, floating rust, and moisture.

[0020] Specifically, the regular purging plan in step S4 is to prevent blockage of the pressure tapping holes and the pressure guiding pipes by regularly performing steam purging, nitrogen purging, or combined purging, and ensure the long-term stable operation of the flowmeter.

[0021] The present invention has the following beneficial effects:

[0022] The constant velocity tube flowmeter with self-cleaning function and its working method designed by the present invention, online cleaning function: By designing an "H"-shaped purging duct assembly and combining the purging functions of steam and nitrogen, online cleaning of the flowmeter is achieved. Compared with the prior art, the present invention can perform cleaning operations without stopping production or gas supply, avoiding production interruptions caused by cleaning and significantly improving production efficiency.

[0023] The constant velocity tube flowmeter with self-cleaning function and its working method designed by the present invention, multiple purging modes: Three modes of steam purging, nitrogen purging, and combined purging (steam + nitrogen) are provided. Users can select the appropriate purging method according to the actual working conditions and the content of medium impurities. This flexibility makes the cleaning effect more efficient and targeted, and can effectively cope with different types of blockage problems.

[0024] The constant velocity tube flowmeter with self-cleaning function and its working method designed by the present invention, preventive cleaning: According to the content of impurities in the medium, purging operations are carried out regularly to play a role in preventing blockages; compared with the prior art, the present invention can not only clean after blockages occur, but also prevent the occurrence of blockages through regular maintenance, extending the service life of the flowmeter.

[0025] The constant velocity tube flowmeter with self-cleaning function and its working method designed by the present invention, efficient cleaning effect: Through the high-temperature softening effect of steam and the strong purging of nitrogen, stubborn impurities such as tar, benzene, and naphthalene can be effectively removed, ensuring that key parts such as the pressure tapping holes and pressure guiding pipes of the flowmeter remain unobstructed; compared with the prior art, the cleaning effect is more thorough, and the accuracy of flow measurement can be significantly improved.

[0026] The constant velocity tube flowmeter with self-cleaning function and its working method designed by the present invention, the purging medium can be flexibly selected: In addition to steam and nitrogen, other suitable purging media can be flexibly selected according to the actual working conditions and medium characteristics; for example, in some special cases, compressed air, inert gases (such as argon) or other chemical cleaning agents can be used as purging media to meet the cleaning requirements for different types of blockages or special media; this flexibility enables the present invention to adapt to a wider range of application scenarios, meet the cleaning requirements in different industries and working conditions, and further enhance the versatility and practicality of the equipment.

[0027] The constant velocity tube flowmeter with self-cleaning function and its working method designed by the present invention, automation of the operation process: The automatic opening and closing of valves are realized through an automatic control system, further simplifying the operation process and reducing manual intervention; the automatic control system automatically performs steam purging, nitrogen purging, or combined purging operations according to the preset purging cycle and mode.

[0028] The present invention has remarkable advantages such as on-line cleaning, multiple purging modes, preventive cleaning, high cleaning efficiency, high-temperature resistance design, and easy operation, which can effectively solve the blockage problem of the constant velocity tube flowmeter when measuring media with more impurities, and ensure the accuracy of flow measurement and the long-term stable operation of the equipment. Description of the Drawings

[0029] Figure 1 Figure 1 is the front view of a constant velocity tube flowmeter with self-cleaning function.

[0030] Figure 2 Figure 2 is the top view of a constant velocity tube flowmeter with self-cleaning function.

[0031] Figure 3 Figure 3 is the cross-sectional view of a constant velocity tube flowmeter in the prior art.

[0032] Figure 4 Figure 4 is the structural schematic diagram of the detection rod of a constant velocity tube flowmeter in the prior art.

[0033] Figure 5 Figure 5 is the actual diagram of the pressure tapping holes of the detection rod being blocked.

[0034] In the figures: 1 - First pressure guiding pipe; 2 - Second pressure guiding pipe; 3 - Steam pipeline; 4 - Nitrogen pipeline; 5 - Detection rod; 6 - Main pressure guiding pipe; 7 - First flange; 8 - Second flange; 9 - Connecting pipe. Detailed Embodiment

[0035] The following will further clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] As Figures 1 - 2 shown, a constant velocity tube flowmeter with self-cleaning function includes an "H"-shaped purging duct assembly. The "H"-shaped purging duct assembly includes a steam pipeline 3 and a nitrogen pipeline 4. A connecting pipe 9 is connected between the steam pipeline 3 and the nitrogen pipeline 4. One end of the steam pipeline 3 is connected to the second pressure guiding pipe 2, and the other end of the steam pipeline 3 is connected to an external steam supply pump. One end of the nitrogen pipeline 4 is connected to the first pressure guiding pipe 1, and the other end of the nitrogen pipeline 4 is connected to an external nitrogen supply pump.

[0037] A steam valve F3 is installed on the steam pipeline 3, and a nitrogen valve F4 is installed on the nitrogen pipeline 4. The steam valve F3 and the nitrogen valve F4 are located outside the connecting pipe 9 to ensure that when a medium (steam or nitrogen) is blown in, both the first pressure guiding pipe 1 and the second pressure guiding pipe 2 are blown into.

[0038] A pressure guide pipe valve F1 is installed on the first pressure guide pipe 1, and a pressure guide pipe valve F2 is installed on the second pressure guide pipe 2. The connection point between the nitrogen pipeline 4 and the first pressure guide pipe 1 is located below the pressure guide pipe valve F1, and the connection point between the steam pipeline 3 and the second pressure guide pipe 2 is located below the pressure guide pipe valve F2.

[0039] Both the first pressure guide pipe 1 and the second pressure guide pipe 2 are connected to the main pressure guide pipe 6. A first flange 7 is provided at the bottom of the main pressure guide pipe 6. The first flange 7 is connected to a second flange 8 by bolts. The second flange 8 is arranged at the top of the detection rod 5, and multiple pressure tapping holes are provided on the detection rod 5.

[0040] The pressure guide pipe valve F1, the pressure guide pipe valve F2, the steam valve F3, and the nitrogen valve F4 are all electrically controlled valves made of high-temperature resistant materials. The high-temperature resistant materials include, but are not limited to, chromium molybdenum steel alloy steel, nickel-based alloy steel, or molybdenum-containing stainless steel to adapt to the high-temperature environment of the steam and ensure the long-term stable operation of the equipment.

[0041] "H"-shaped purging conduit assembly: This assembly is designed to connect the pressure guide pipes of the flowmeter and is respectively connected to the steam pipeline 3 and the nitrogen pipeline 4 through a tee structure to achieve on-line purging and cleaning inside the flowmeter.

[0042] Combined installation position of the "H"-shaped purging conduit assembly and the flowmeter: This assembly is installed below the pressure guide pipe valve to ensure that steam and nitrogen can effectively enter the static pressure pipe, total pressure extraction pipe, detection rod, and pressure tapping holes of the flowmeter for purging and cleaning, and can be effectively isolated from the pressure sensor to prevent damage to the sensor caused by the high temperature of the steam.

[0043] Operation mode and purging mode of on-line purging: By controlling the steam valve F3 and the nitrogen valve F4, three modes of steam purging, nitrogen purging, or combined purging can be achieved. The specific operation includes closing the pressure guide pipe valve F1 and the pressure guide pipe valve F2, opening the steam valve F3 to introduce steam to soften impurities, then closing the steam valve F3, and opening the nitrogen valve F4 to introduce nitrogen for further purging and drying the moisture.

[0044] A constant velocity tube flowmeter with self-cleaning function, purging mode: Three modes of steam purging, nitrogen purging, or combined purging (steam + nitrogen) can be selected according to actual needs to achieve effective cleaning inside the flowmeter. Preventive cleaning function: According to the content of impurities in the medium, purging operations are carried out regularly to prevent blockage of the pressure tapping holes and pressure guide pipes and ensure the accuracy of flow measurement. Operation without stopping production or gas supply: This design allows on-line purging and cleaning without stopping production or gas supply, reducing production interruption and improving production efficiency.

[0045] This application focuses on the design, installation location, online purging operation mode, purging mode, high-temperature resistance design of the valve, and preventive cleaning function of the "H"-shaped purging duct assembly, ensuring the self-cleaning ability and measurement accuracy of the flowmeter under complex working conditions.

[0046] A working method for a constant velocity tube flowmeter with a self-cleaning function includes the following steps:

[0047] 1. Steam purging operation: When the pressure tapping hole or the pressure guiding tube of the flowmeter is blocked, close the pressure guiding tube valves F1 and F2 to cut off the medium flow, open the steam valve F3, and introduce high-temperature steam; the steam enters the static pressure tube, total pressure extraction tube, detection rod, and pressure tapping hole of the flowmeter through the "H"-shaped purging duct assembly, using the high temperature of the steam to soften stubborn impurities such as tar, benzene, and naphthalene. After steam purging for a period of time, close the valve F3 to stop the steam introduction.

[0048] 2. Nitrogen purging operation: Open the nitrogen valve F4 to introduce nitrogen; the nitrogen enters the interior of the flowmeter through the "H"-shaped purging duct assembly to purge the static pressure tube, total pressure extraction tube, detection rod, and pressure tapping hole to remove impurities such as dust, floating rust, and moisture.

[0049] 3. Combined purging mode: In actual operation, select the combined purging mode according to the severity of the blockage. First, introduce steam to soften the impurities, and then introduce nitrogen for strong purging and drying to ensure a more thorough cleaning effect.

[0050] 4. Regular preventive cleaning: According to the content of impurities in the medium, formulate a regular purging plan. The regular purging plan is to prevent the blockage of the pressure tapping hole and the pressure guiding tube by regularly performing steam purging, nitrogen purging, or combined purging to ensure the long-term stable operation of the flowmeter.

[0051] The present invention is not limited to the above embodiments. Anyone should know that structural changes made under the inspiration of the present invention, as long as they have the same or similar technical solutions as the present invention, fall within the protection scope of the present invention.

[0052] The technologies, shapes, and structures not described in detail in the present invention are all well-known technologies.

Claims

1. A constant velocity tube flowmeter with a self-cleaning function, characterized in that, It includes an "H"-shaped purging duct assembly. The "H"-shaped purging duct assembly includes a steam pipeline and a nitrogen pipeline. A connecting pipe is connected between the steam pipeline and the nitrogen pipeline. One end of the steam pipeline is connected to the second pressure guiding pipe, and the other end of the steam pipeline is connected to an external steam supply pump. One end of the nitrogen pipeline is connected to the first pressure guiding pipe, and the other end of the nitrogen pipeline is connected to an external nitrogen supply pump.

2. The constant-speed tube flowmeter with a self-cleaning function according to claim 1, wherein, A steam valve F3 is installed on the steam pipeline, and a nitrogen valve F4 is installed on the nitrogen pipeline. The steam valve F3 and the nitrogen valve F4 are located outside the connecting pipe.

3. The uniform flow tube flowmeter with self-cleaning function according to claim 2, characterized in that, A pressure guiding pipe valve F1 is installed on the first pressure guiding pipe, and a pressure guiding pipe valve F2 is installed on the second pressure guiding pipe. The connection point between the nitrogen pipeline and the first pressure guiding pipe is located below the pressure guiding pipe valve F1, and the connection point between the steam pipeline and the second pressure guiding pipe is located below the pressure guiding pipe valve F2.

4. The constant-speed tube flowmeter with self-cleaning function according to claim 3, characterized in that, Both the first pressure guiding pipe and the second pressure guiding pipe are connected to a main pressure guiding pipe. A first flange is provided at the bottom of the main pressure guiding pipe. The first flange is connected to a second flange by bolts. The second flange is arranged at the top of a detection rod, and a plurality of pressure tapping holes are provided on the detection rod.

5. The constant-speed tube flowmeter with a self-cleaning function according to claim 4, characterized in that, The pressure guiding pipe valve F1, the pressure guiding pipe valve F2, the steam valve F3, and the nitrogen valve F4 are all electronically controlled valves made of high-temperature resistant materials.

6. The working method of the constant-speed tube flowmeter with self-cleaning function according to any one of claims 1-5, characterized in that, It includes the following steps: S1. Steam purging operation: When the pressure tapping hole or the pressure guiding pipe of the flowmeter is blocked, close the pressure guiding pipe valve F1 and the pressure guiding pipe valve F2 to cut off the medium flow, open the steam valve F3, and introduce high-temperature steam. S2. Nitrogen purging operation: Open the nitrogen valve F4 and introduce nitrogen. S3. Combined purging mode: In actual operation, select the combined purging mode according to the severity of the blockage. First, introduce steam to soften the impurities, and then introduce nitrogen for strong purging and drying, so that the cleaning effect is more thorough. S4. Regular preventive cleaning: According to the content of impurities in the medium, formulate a regular purging plan.

7. The working method of the constant-speed tube flowmeter with a self-cleaning function according to claim 6, characterized in that, The steam in step S1 enters the static pressure pipe, total pressure extraction pipe, detection rod, and pressure tapping holes of the flowmeter through the "H"-shaped purging duct assembly. The high temperature of the steam is used to soften stubborn impurities such as tar, benzene, and naphthalene. After the steam purging for a period of time, close the valve F3 and stop introducing steam.

8. The working method of the constant-speed tube flowmeter with self-cleaning function according to claim 6, characterized in that, The nitrogen in step S2 enters the interior of the flowmeter through the "H"-shaped purging duct assembly to purge the static pressure pipe, total pressure extraction pipe, detection rod, and pressure tapping holes, and remove impurities such as dust, floating rust, and moisture.

9. The working method of the constant-speed tube flowmeter with a self-cleaning function according to claim 6, characterized in that, The regular purging plan in step S4 is to prevent the blockage of the pressure tapping holes and the pressure guiding pipes by regularly performing steam purging, nitrogen purging, or combined purging, so as to ensure the long-term stable operation of the flowmeter.

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