Horizontal metal tube float flowmeter with high-pressure spring structure

Abstract

A horizontal metal tube float flowmeter with a high-pressure spring structure comprises a horizontal transverse tube, a flange, an inlet guider, a floater body, a pore plate, an upper guide rod, a cylindrical spiral compression spring, an outlet guider and a clamping ring, and is further provided with an instrument support, and an instrument used for displaying flow is fixed to one side of the horizontal transverse tube through the instrument support. The instrument is provided with a coupling magnetic steel converter, the coupling magnetic steel converter is coupled with the magnetic steel sleeve on the floater body, rotation of an instrument pointer is achieved, and the reading direction of the instrument pointer is the clockwise direction. According to the flowmeter, the structural size is simplified, and the application range of the installation space is expanded. Due to the application of the cylindrical spiral compression spring, the impact phenomenon of the internal structure of the floater caused by high-speed operation of a water hammer when the flow of a process medium changes suddenly is eliminated, a good damping effect is achieved, and the shaking phenomenon caused by instability of a converter pointer is eliminated. The horizontal metal tube float flowmeter with the spring structure has outstanding practical application value.

Description

Technical Field

[0001] This invention relates to a flow meter, particularly a high-pressure type spring structure horizontal metal tube float flow meter. Background Technology

[0002] Fluid measurement technology has been widely used along with global economic industrialization and trade settlement. Fluid measurement technology and scientific application technology are important components of related technical fields and occupy an indispensable position in the national economy.

[0003] In the process of energy (gas or liquid) cooperation across various industries, there is also an undeniable reality: with the continuous depletion of traditional non-renewable energy sources, flow meters are inevitably used in trade accounting projects for process control of process media. To meet user performance requirements while aiming to reduce the cost of measuring devices, and based on the limitations of on-site installation conditions and years of practical experience, a high-pressure spring-structured horizontal metal tube float flow meter has been designed and developed. This product simplifies the overall structure of the original horizontal metal tube float flow meter measuring device, making it a highly integrated measuring device. It is widely used in power industries (including nuclear industry), chemical industry, petroleum, metallurgy, electric power, scientific research, and domestic and international fluid process control industries. Due to its high cost-effectiveness, it has broad application and development prospects.

[0004] Applications of various flow meters: In process control and fluid measurement, various fluid measurement devices are widely used according to different on-site working conditions. Most flow measurement devices have some shortcomings in application. Some flow meters have very low cost performance, and some flow meters can only measure a single medium (for example, electromagnetic flow meters can only measure liquids, and the conductivity must be greater than or equal to 5μs / cm, otherwise, it is impossible to collect the flow signal of the fluid during flow). Among different flow measurement devices of the same specification, some flow meters are bulky, expensive, and have long production cycles. However, the most widely used metal tube float flow meters perfectly make up for the above shortcomings. Metal tube float flow meters can measure both liquids and gases, have a very high cost performance, and have a short production cycle.

[0005] Metal tube float flow meters typically adopt a vertical installation structure with the pipeline medium flowing from bottom to top. However, due to the limitations of the pipeline location in actual production and application, users require horizontal metal tube float flow meters.

[0006] Generally, horizontal metal tube float flowmeters come in two structural forms: atmospheric pressure type and high pressure type.

[0007] (1) The horizontal metal tube float flowmeter is now in the form of a normal pressure (e.g., DN20, PN40), that is, the vertical type with an additional sleeve, and then the left and right horizontal pipes and connecting flanges are installed (left inlet and right outlet type or right inlet and left outlet type are both this structure). This structure fully meets the user's performance requirements.

[0008] (2) The volume structure of the high-pressure type (e.g., DN20, PN160) horizontal metal tube float flow meter will change significantly. Due to the thicker outer tube of the measuring tube (wall thickness = 11mm), if the float still adopts the normal pressure type structure, the magnetic coupling between the active magnet of the float in the sensor (material: ALNiCo5) and the coupling magnet of the pointer shaft of the converter (material: ALNiCo5) will be very weak, making the high-pressure horizontal metal tube float flow meter unable to work properly.

[0009] To enhance magnetic coupling, the float adopts an integrated structure, with the float magnet moved to the top. This structure involves adding two necked welding flanges, eight sets of fully threaded studs (size: M16×150), and other corresponding components. Its high cost increases the cost-effectiveness ratio for users, reducing the overall cost-effectiveness of horizontal metal tube float flowmeters.

[0010] In today's world, with its ever-increasing global energy consumption, and in order to improve the utilization rate of various energy sources, based on the premise of technological innovation leading to new quality scientific and technological productivity, and combining theoretical knowledge with years of practical experience, we have continuously optimized the structure of horizontal metal tube float flowmeters, and designed and developed a high-pressure spring structure horizontal metal tube float flowmeter. Existing technologies (CN111678561A, DE2844392A1) lack an instrument conversion bracket, making it impossible to achieve a simple installation structure for horizontal flow testing, and failing to guarantee that the pointer reading direction conforms to the conventional direction. Summary of the Invention

[0011] To ensure that the horizontal float flowmeter has good observability and comfortable operation, and to solve the above-mentioned problems in the background art, the present invention provides a high-pressure spring structure horizontal metal tube float flowmeter.

[0012] A high-pressure spring-structured horizontal metal tube float flowmeter includes a horizontal tube, flange, inlet guide, float body, orifice plate, upper guide rod, cylindrical helical compression spring, outlet guide, and retaining ring.

[0013] Flanges are provided at both ends of the horizontal pipe for connecting to the pipe whose flow rate is to be measured. The flow direction of the fluid in the pipe to be measured is the same as that of the horizontal pipe.

[0014] An inlet guide is provided at the fluid inlet end of the horizontal cross channel, and the outlet of the inlet guide corresponds to one end of the float body.

[0015] A perforated plate is fixedly installed on the inner wall of the horizontal tube. The float body passes through the perforated plate and can move back and forth along the perforated plate.

[0016] A magnetic sleeve is installed inside the float;

[0017] The float is mounted on the upper guide rod and can reciprocate on the upper guide rod under the propulsion of the fluid;

[0018] The outlet of the horizontal tube is equipped with an outlet guide. The outlet guide is fixed to the inner wall of the outlet end of the horizontal tube by a retaining ring. The end of the upper guide rod away from the float body is fixed to the outlet guide.

[0019] A cylindrical helical compression spring is fitted over the upper guide rod. The end of the float body away from the inlet guide abuts against the cylindrical helical compression spring, and the end of the cylindrical helical compression spring away from the float body abuts against the outlet guide.

[0020] The improvement is that an instrument bracket is also provided, and the instrument for displaying the flow rate is fixed to one side of the horizontal pipe through the instrument bracket. The instrument is equipped with a coupling magnet converter, which is coupled with the magnet sleeve on the float body to realize the rotation of the instrument pointer. The reading direction of the instrument pointer is clockwise.

[0021] Furthermore, the projection of the instrument pointer's axial direction onto the vertical plane is perpendicular to the projection of the horizontal tube's axis onto the vertical plane.

[0022] Furthermore, the instrument bracket is formed by bending a plate, and the cross-section along the circumference of the horizontal tube is a frame with one end open.

[0023] Furthermore, the back of the instrument is connected to the instrument bracket by bolts, and the coupling magnet converter is connected to the back of the instrument and is connected to the pointer drive of the instrument.

[0024] Furthermore, the coupling magnet converter is provided with a transmission rod, and a coupling magnet fixing plate is provided at the end of the transmission rod. Two coupling magnets are fixed on the outer periphery of the coupling magnet fixing plate, and a coupling magnet counterweight is provided on the outer periphery of the coupling magnet fixing plate corresponding to the two coupling magnets.

[0025] Furthermore, the included angle between the two coupled magnets is an obtuse angle;

[0026] Furthermore, the coupling magnet converter is also provided with a housing, and the transmission rod is rotatably disposed within the housing;

[0027] Furthermore, the end of the transmission rod furthest from the coupling magnet fixed plate is connected to the pointer shaft via a transmission gear;

[0028] Furthermore, the instrument bracket is fixed to the horizontal pipe through the opening of the frame. When the fluid in the horizontal pipe is inlet from right to outlet from left, the opening of the frame is on the lower side; when the fluid in the horizontal pipe is inlet from left to outlet from right, the opening of the frame is on the upper side.

[0029] Furthermore, the pressure that the wall of the horizontal pipe can withstand is determined according to the following formula:

[0030] Formula for calculating pressure in seamless stainless steel pipes:

[0031]

[0032] Where: P -- the pressure that the steel pipe can withstand, kqf / cm 2

[0033] d1---Outer diameter of steel pipe (cm)

[0034] d2---Inner diameter of steel pipe (cm)

[0035] σ --- Yield strength of steel pipe material (kqf / cm) 2

[0036] n---The safety factor is usually taken as 1 or (2.0~5.0).

[0037] The advantages of this invention are:

[0038] (1) Under the premise of fully meeting the actual performance requirements of users on site, the cost-effectiveness ratio of users has been reasonably and effectively reduced, and the cost-effectiveness of the product has been improved.

[0039] (2) Due to the special design of the high-pressure spring structure horizontal metal tube float flowmeter, the difficulty is: how to assemble the converter into the correct position. The original converter bracket must be optimized so that the product structure is simple, the overall structural weight is greatly reduced, and the characteristics of easy installation and maintenance, reliable and stable working performance, and long service life are achieved.

[0040] (3) Due to the reaction force of the cylindrical helical compression spring, the diameter of the measuring tube and the specifications of the flange are reduced accordingly under the same range, which also saves a variety of parts and components materials, thereby greatly improving the cost performance.

[0041] (4) The range of applicable specifications has been greatly improved: ≤DN200. Attached Figure Description

[0042] Figure 1 This is the front view of the invention.

[0043] Figure 2 Left view of the present invention

[0044] Figure 3 This is an axial sectional view of the present invention.

[0045] Figure 4 This is a partially enlarged view of the coupling magnet transmission of the present invention.

[0046] Figure 5 This is a top view of the present invention.

[0047] Figure 6 Example 1 of the instrument bracket of the present invention

[0048] Figure 7 Example 2 of the instrument bracket of the present invention

[0049] Markings: 1. Flange; 2. Inlet guide; 3. Float body; 4. Orifice plate; 5. Upper guide rod; 6. Cylindrical helical compression spring; 7. Outlet guide; 8. Snap ring; 9. Instrument; 10. Instrument bracket; 20. Magnet sleeve; 21. Coupling magnet fixing plate; 22. Coupling magnet counterweight; 23. Coupling magnet; 24. Outer shell; 30. Frame. Detailed Implementation

[0050] See appendix Figure 1-7 The specific implementation of the present invention is as follows:

[0051] A high-pressure spring-structured horizontal metal tube float flowmeter includes a horizontal tube, flange 1, inlet guide 2, float body 3, orifice plate 4, upper guide rod 5, cylindrical helical compression spring 6, outlet guide 7, and retaining ring 8. Flanges are provided at both ends of the horizontal tube for connection to the pipeline to be measured, with the fluid flow direction in the pipeline being measured being the same as that of the horizontal tube. An inlet guide 2 is provided at the fluid inlet end of the horizontal tube, and the outlet of the inlet guide 2 corresponds to one end of the float body 3. An orifice plate 4 is fixedly installed on the inner wall of the horizontal tube, through which the float body 3 passes and can reciprocate along the orifice plate. A magnetic sleeve 20 is installed inside the body 3; the float body 3 is sleeved on the upper guide rod 5 and can reciprocate on the upper guide rod 5 under the propulsion of the fluid; an outlet guide 7 is provided at the outlet of the horizontal pipe, and the outlet guide 7 is fixed to the inner wall of the outlet end of the horizontal pipe by a retaining ring 8; the end of the upper guide rod 5 away from the float body 3 is fixed on the outlet guide 7; a cylindrical helical compression spring 6 is sleeved on the upper guide rod 5, and the end of the float body 3 away from the inlet guide 2 abuts against the cylindrical helical compression spring 6, and the end of the cylindrical helical compression spring 6 away from the float body 3 abuts against the outlet guide 7;

[0052] The improvements are as follows: An instrument bracket 10 is also provided, through which the flow meter is fixed to one side of the horizontal tube. The meter is equipped with a coupling magnet converter, which is coupled to the magnet sleeve 20 on the float body 3 to achieve the rotation of the meter pointer. The reading direction of the meter pointer is clockwise. The projection of the axial direction of the meter pointer onto the vertical plane is perpendicular to the projection of the horizontal tube axis onto the vertical plane. The instrument bracket 10 is formed by bending a plate, and its cross-section along the circumference of the horizontal tube is a frame 30 with one open end. The back of the meter is connected to the instrument bracket by bolts, and the coupling magnet converter is connected to the back of the meter and is connected to the pointer of the meter. The coupling magnet converter is equipped with a transmission rod, and the end of the transmission rod is equipped with a coupling magnet fixing plate 21. Two coupling magnets 23 are fixed on the outer periphery of the coupling magnet fixing plate 21, which are connected to the aforementioned two... Coupling magnet 23 is correspondingly provided with a coupling magnet counterweight 22 on the outer periphery of the coupling magnet fixing plate; the included angle between the two coupling magnets 23 is an obtuse angle; the coupling magnet converter is also provided with a housing, and the transmission rod is rotatably disposed in the housing; the end of the transmission rod away from the coupling magnet fixing plate is connected to the pointer shaft through a transmission gear; the instrument bracket is fixed to the horizontal tube through the opening of the frame, and when the fluid in the horizontal tube is right in and left out, the opening of the frame is on the lower side; when the fluid in the horizontal tube is left in and right out, the opening of the frame is on the upper side;

[0053] The pressure that the wall of a horizontal pipe can withstand is determined according to the following formula:

[0054] Formula for calculating pressure in seamless stainless steel pipes:

[0055]

[0056] Where: P -- the pressure that the steel pipe can withstand (kgf / cm²) 2

[0057] d1---Outer diameter of steel pipe (cm)

[0058] d2---Inner diameter of steel pipe (cm)

[0059] σ --- Yield strength of steel pipe material (kqf / cm) 2

[0060] n---The safety factor is usually taken as 1 or (2.0~5.0).

[0061] The overall structure of the high-pressure spring-type horizontal metal tube float flow meter includes: a connecting flange (threaded connection is also possible according to user requirements), a measuring tube, an inlet guide, an orifice plate, a float, a cylindrical helical compression spring, an outlet guide, an outlet guide retaining ring, a converter bracket, and a converter assembly.

[0062] Its difficulties:

[0063] 1. According to the national standard GB / T2089-2009 "Dimensions and parameters of ordinary cylindrical helical compression springs", its dimensions are determined as follows: (1) Basic dimensions: outer diameter (D), wire diameter (d), mean diameter, free height (L).

[0064] (2) Mechanical properties: stiffness coefficient (K), maximum working load (F), deformation (f).

[0065] (3) Determine the material to be used based on the process medium.

[0066] According to Hooke's Law: F = kx

[0067] Where: F --- the elastic force acting on the spring or elastic body (unit: Newton, N)

[0068] k---Spring coefficient (unit: N / m), reflecting the elastic properties of the material; x---Deformation (unit: m), i.e., the elongation or compression of the spring. Cylindrical helical compression spring design: Based on the movement distance of the float in the horizontal metal tube float flowmeter, i.e., by calculating the required spring force using the known deformation, and simultaneously considering the flow velocity of the process medium and the changing annular area of ​​the float during operation, various technical parameters are designed. 2. Due to the special nature of this structure, the installation method of the converter also undergoes fundamental changes, and the structural design of its converter bracket is as follows:

[0069] To ensure convenient and clear visibility for operators viewing the converter, and to facilitate clockwise rotation of the converter pointer, the structure of the converter's mounting bracket was specially designed to meet ergonomic requirements. This perfectly solved the converter installation problem and achieved the designed effect. The structural dimensions of the converter mounting bracket are determined by the flow direction of the process medium. While the geometric dimensions of the mounting bracket vary depending on the nominal dimensions of the metal tube float flowmeter, these are considered standard structural dimensions for the product. The designed and manufactured mounting brackets are for atmospheric pressure or high pressure type horizontal metal tube float converters with spring structures.

[0070] 3. Based on the working principle of the spring-loaded horizontal metal tube float flowmeter, the design of the float structure dimensions is as follows:

[0071] Metal tube float flowmeters operate in both forward and reverse strokes. During operation, the flow rate depends entirely on the balance between the flow rate of the process medium and the reaction force of the cylindrical helical compression spring. At this point, the active magnet inside the float couples with the follower magnet fixed to the pointer shaft of the converter, causing the pointer to remain stationary at a specific position. The standard meter then displays the instantaneous flow rate of the process pipeline, and the converter's dial also records this instantaneous flow rate.

[0072] When the flow rate in the process pipeline decreases, the float returns to its original position due to the reaction force of the cylindrical helical compression spring. The working principle and the instantaneous flow rate displayed by the standard gauge are the same as the working principle of the forward stroke.

[0073] The structural dimensions and geometric shape of the float vary considerably. The design of the float's geometric dimensions is based on relevant data such as the technical parameters of the process medium and the selection of the float material. Through years of work experience and the combination of theoretical knowledge, a regular structural dimension and geometric shape has been formed.

[0074] 4. Design the pipe wall thickness based on the technical parameters provided by the user:

[0075] Regardless of whether it's an atmospheric pressure or high pressure type, the basic technical parameters of the spring-structured horizontal metal tube float flowmeter are fixed according to the People's Republic of China Machinery Industry Standard: JB / T6844-2015 "Metal Tube Float Flowmeter". There are eight nominal diameter specifications: DN15, DN25, DN50, DN80, DN100, DN150, DN200, and DN250. However, the dimensions of the measuring tube are determined by calculating the mechanical strength based on the nominal pressure and the mechanical properties of austenitic stainless steel, thus determining its wall thickness: δ. The strength of the austenitic stainless steel measuring tube is calculated using the pressure formula to determine the tube dimensions.

[0076] Formula for calculating pressure in seamless stainless steel pipes:

[0077]

[0078] Where: P -- the pressure that the steel pipe can withstand (kgf / cm²) 2

[0079] d1---Outer diameter of steel pipe (cm)

[0080] d2---Inner diameter of steel pipe (cm)

[0081] σ --- Yield strength of steel pipe material (kqf / cm) 2

[0082] n---The safety factor is usually taken as 1 or (2.0~5.0).

[0083] Metal tube float flowmeters, whether atmospheric pressure or high pressure type:

[0084] Nominal size: DN15 type with inner diameter: d2 = 2.7cm; Nominal size: DN25 type with inner diameter: d2 = 3.9cm; Nominal size: DN50 type with inner diameter: d2 = 6.8cm; Nominal size: DN80 type with inner diameter: d2 = 9.2cm; Nominal size: DN100 type with inner diameter: d2 = 11.1cm; Nominal size: DN150 type with inner diameter: d2 = 14.9cm; Nominal size: DN200 type with inner diameter: d2 = 20.3cm; Nominal size: DN250 type with inner diameter: d2 = 25.1cm. σ---yield strength of steel pipe material (kgf / cm²). 2 The materials used in metal tube float flowmeters can be found in the "Metal Materials" handbook or the "Mechanical Design" handbook.

[0085] n---Safety factor, taken as 1 or (2.0~5.0) depending on the increase in nominal pressure.

[0086] Based on the above known conditions, the pressure calculation formula for stainless steel pipes is used to calculate the outer diameter of the steel pipe: d1, and the wall thickness of the metal pipe float flowmeter: δ=d1-d1

[0087] This invention has a compact structure, and all specifications and forms have fixed external dimensions, which facilitates installation and maintenance; at the same time, it also facilitates the adoption of a mass production and standardized production mode for products, that is, to achieve standardization of parts, generalization of components, and serialization of products.

[0088] The spring-structured horizontal metal tube float flowmeter, whether in atmospheric or high pressure configuration, completely overturns the traditional structural form of horizontal metal tube float flowmeters.

[0089] Its most notable features are:

[0090] 1. While fully meeting the user's technical parameter requirements, the structural dimensions are greatly simplified, expanding the scope of installation space utilization.

[0091] 2. While fully meeting the user's technical parameter requirements, it boasts outstanding performance indicators, high cost-effectiveness, and market competitiveness.

[0092] 3. Due to the application of cylindrical helical compression springs, the impact phenomenon of internal structure caused by water hammer at high speed when the flow rate of the process medium changes suddenly is eliminated, which has a good damping effect and eliminates the jitter phenomenon caused by the instability of the converter pointer.

[0093] 4. The spring-structured horizontal metal tube float flowmeter, whether in atmospheric or high pressure configuration, is simple in structure and greatly reduces product costs due to its design. In today's environment of increasingly scarce non-renewable energy resources, it has outstanding practical application value.

Claims

1. A high-pressure spring-structured horizontal metal tube float flowmeter, comprising a horizontal tube, flange, inlet guide, float body, orifice plate, upper guide rod, cylindrical helical compression spring, outlet guide, and retaining ring. Flanges are provided at both ends of the horizontal pipe for connecting to the pipe whose flow rate is to be measured. The flow direction of the fluid in the pipe to be measured is the same as that of the horizontal pipe. An inlet guide is provided at the fluid inlet end of the horizontal cross channel, and the outlet of the inlet guide corresponds to one end of the float body. A perforated plate is fixedly installed on the inner wall of the horizontal tube. The float body passes through the perforated plate and can move back and forth along the perforated plate. A magnetic sleeve is installed inside the float; The float is mounted on the upper guide rod and can reciprocate on the upper guide rod under the propulsion of the fluid; The outlet of the horizontal tube is equipped with an outlet guide. The outlet guide is fixed to the inner wall of the outlet end of the horizontal tube by a retaining ring. The end of the upper guide rod away from the float body is fixed to the outlet guide. A cylindrical helical compression spring is fitted over the upper guide rod. The end of the float body away from the inlet guide abuts against the cylindrical helical compression spring, and the end of the cylindrical helical compression spring away from the float body abuts against the outlet guide. Its features are: An instrument bracket is also provided, and the instrument for displaying the flow rate is fixed to one side of the horizontal pipe through the instrument bracket. The instrument is equipped with a coupling magnet converter, which is coupled with the magnet sleeve on the float body to realize the rotation of the instrument pointer. The reading direction of the instrument pointer is clockwise.

2. The metal tube float flowmeter according to claim 1, wherein, The projection of the instrument pointer's axial direction onto the vertical plane is perpendicular to the projection of the horizontal tube's axis onto the vertical plane.

3. The metal tube float flowmeter according to claim 2, wherein, The instrument bracket is formed by bending a plate, and the cross-section along the circumference of the horizontal tube is a frame with one end open.

4. The metal tube float flowmeter according to claim 3, wherein, The back of the instrument is connected to the instrument bracket by bolts. The coupling magnet converter is connected to the back of the instrument and is connected to the pointer drive of the instrument.

5. The metal tube float flowmeter according to claim 4, wherein, The coupling magnet converter is equipped with a transmission rod, and a coupling magnet fixing plate is provided at the end of the transmission rod. Two coupling magnets are fixed on the outer periphery of the coupling magnet fixing plate, and a coupling magnet counterweight is provided on the outer periphery of the coupling magnet fixing plate in correspondence with the two coupling magnets.

6. The metal tube float flowmeter according to claim 5, wherein, The angle between the two coupled magnets is obtuse.

7. The metal tube float flowmeter according to claim 6, wherein, The coupling magnet converter is also provided with a housing, and the transmission rod is rotatably disposed within the housing.

8. The metal tube float flowmeter according to claim 7, wherein, The end of the transmission rod away from the coupling magnet fixed plate is connected to the pointer shaft via a transmission gear.

9. The metal tube float flowmeter according to claim 8, wherein, The instrument bracket is fixed to the horizontal pipe through the opening of the frame. When the fluid in the horizontal pipe is inlet from right to outlet from left, the opening of the frame is on the bottom side; when the fluid in the horizontal pipe is inlet from left to outlet from right, the opening of the frame is on the top side.

10. The metal tube float flowmeter according to claim 9, wherein, The pressure that the wall of a horizontal pipe can withstand is determined according to the following formula: Formula for calculating pressure on seamless stainless steel pipes: Where: P -- the pressure that the steel pipe can withstand (kgf / cm²) 2 d1---Outer diameter of steel pipe (cm) d2---Inner diameter of steel pipe (cm) σ --- Yield strength of steel pipe material (kgf / cm) 2 n---The safety factor is usually taken as 1 or (2.0 to 5.0).

Images