An ultrasonic V-cone flowmeter with anti-interference and accurate measurement

Abstract

The present invention discloses an ultrasonic V-cone flowmeter with anti-interference and accurate measurement, comprising a tube body, a positive pressure head provided at the upper end of the tube body, and a slot provided at the lower end of a second limit block. The ultrasonic V-cone flowmeter connects an ultrasonic sensor via a connecting seat, and then installs the ultrasonic sensor into a mounting seat via the connecting seat. At the same time, the first limit block and the first spring can be used to facilitate replacement and maintenance of the sensor at any time, thereby enhancing the stability of the ultrasonic sensor after installation, reducing external interference to the ultrasonic sensor, and improving work efficiency. A limiting device is added to the interior of the V-cone and the tube body to improve the stability of the V-cone when impacted by fluid. At the same time, the device can be automatically adjusted in telescopic manner and can be adjusted according to V-cones of different heights, achieving a good limiting effect and greatly improving practicality. In addition, the ultrasonic V-cone flowmeter described in the present invention has a good anti-corrosion effect by setting a coating on the inner and outer surfaces of the V-cone, the inner surface of the tube, etc. At the same time, the coating has good high temperature resistance, leveling and adhesion. The good adhesion reduces the probability of the coating detaching during the operation of the flowmeter. The good leveling performance reduces the possibility of the medium adhering to the V-cone flowmeter during operation, thereby improving the measurement accuracy of the V-cone flowmeter.

Description

Technical Field

[0001] The invention relates to the technical field of V-cone flowmeters, in particular to an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement. Background Art

[0002] The V-cone flowmeter is a flow measurement instrument that uses the throttling effect generated by the V-cone in the flow field to measure flow by detecting the upstream and downstream pressure difference. Compared with ordinary throttling parts, the V-cone flowmeter changes the throttling layout, changing from center hole throttling to annular throttling. The working environment of the V-cone flowmeter is mainly liquid, gas, steam, etc. The inner surface of the V-cone flowmeter tube and the inner and outer surfaces of the V cone are immersed in liquid, gas, steam and other media for a long time, making the inner surface of the tube and the inner and outer surfaces of the V cone prone to surface corrosion. At the same time, for V-cone flowmeters used to measure high-temperature media, the high temperature environment will aggravate the corrosion of the inner surface of the tube and the inner and outer surfaces of the V cone. The rough corroded surface is easy to adhere to the flowing medium during operation, reducing the measurement accuracy of the V-cone flowmeter.

[0003] When using an ultrasonic sensor in an existing V-cone flowmeter, there is no very stable mounting structure for the sensor, which makes it easy for the ultrasonic sensor to be installed unstable, resulting in inaccurate ultrasonic detection data and easy interference from the external environment. At the same time, the V-cone inside the existing V-cone flowmeter does not have a good fixed structure, which makes it easy for the V-cone to be impacted when subjected to a large fluid impact, reducing its service life and greatly reducing its practicality. Summary of the Invention

[0004] The purpose of the present invention is to provide an ultrasonic V-cone flowmeter that is anti-interference and has accurate measurement, so as to solve the technical problems mentioned in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A structurally stable ultrasonic V-cone flowmeter comprises a tube body 1, wherein a positive pressure head 2 is provided at the upper end of the tube body 1; a first pressure-taking tube 3 is connected to the upper end of the positive pressure-taking tube 2; a differential pressure gauge 4 is provided on the outer side of the first pressure-taking tube 3; an integrator 5 is connected to the upper end of the differential pressure gauge 4; a second pressure-taking tube 6 is provided on the right end of the differential pressure gauge 4; a negative pressure head 7 is connected to the lower end of the negative pressure head 7; a third pressure tube 8 is connected to the right side of the third pressure tube 8; a V-cone 9 is fixedly connected to the right side of the third pressure tube 8; the upper end of the tube body 1 is located at the left end of the positive pressure head 2 and is fixedly connected to a mounting seat 10; a second cavity 16 is opened inside the right end of the tube body 1.

[0007] Preferably, the positive pressure head 2 is fixedly connected to the first pressure-taking tube 3, and the upper end of the positive pressure head 2 is connected to the lower end of the first pressure-taking tube 3; the negative pressure head 7 is fixedly connected to the second pressure-taking tube 6, and the lower end of the second pressure-taking tube 6 is connected to the upper end of the negative pressure head 7; the negative pressure head 7 is fixedly connected to the third pressure-taking tube 8; the lower end of the negative pressure head 7 is connected to the upper end of the third pressure-taking tube 8.

[0008] Preferably, the mounting base 10 is provided with a connecting base 11; the connecting base 11 is provided with an ultrasonic sensor 12; the connecting base 11 is provided with a first cavity 13; the first cavity 13 is provided with a first stopper 14; and the first spring 15 is provided outside the first stopper 14. The first stopper 14 is movably connected to the connecting base 11 via the first spring 15; the end of the first stopper 14 away from the first cavity 13 extends through the mounting base 10 to the outside of the mounting base 10.

[0009] Preferably, a second limit block 17 is provided inside the second cavity 16; a second spring 18 is provided on the outside of the second limit block 17; the second limit block 17 is movably connected to the second limit block 17 through the second spring 18; a slot 19 is provided at the lower end of the second limit block 17; one end inside the slot 19 is in contact with the end face on the right side of the V-cone 9.

[0010] Preferably, a plurality of the first cavities 13 , the first limiting blocks 14 and the first springs 15 are respectively distributed about the vertical center line of the connecting seat 11 .

[0011] Preferably, a plurality of the second cavities 16 , the second limiting blocks 17 , the second springs 18 and the locking slots 19 are respectively distributed about the horizontal center line of the V-cone 9 .

[0012] Preferably, the distribution form is annular distribution.

[0013] Preferably, the ultrasonic sensor 12 is electrically connected to the integrator 5 and the differential pressure gauge 4 .

[0014] Preferably, the inner surface of the tube body 1 , the outer surface of the third pressure-inducing tube 8 , the inner and outer surfaces of the V-cone 9 , and the outer surface of the second limiting block 17 are provided with a coating.

[0015] Preferably, the raw materials of the coating include epoxy resin, benzoxazine monomer, organosiloxane, solvent, and additives.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The ultrasonic V-cone flowmeter described in the present invention connects the ultrasonic sensor through the connecting seat through the arrangement of the mounting seat, the connecting seat, the ultrasonic sensor, the first cavity, the first limit block and the first spring, and then installs the ultrasonic sensor into the mounting seat through the connecting seat. At the same time, the connecting seat and the mounting seat can be quickly installed and disassembled through the telescopic effect of the first limit block and the first spring, which is convenient for replacing and maintaining the sensor at any time. At the same time, the stability of the ultrasonic sensor after installation is enhanced, the ultrasonic sensor is reduced from external interference, and the work efficiency is improved.

[0018] 2. The ultrasonic V-cone flowmeter described in the present invention adds a limiting device between the V-cone and the inside of the tube body through the arrangement of the second cavity, the second limiting block, the second spring and the card slot, which can improve the stability of the V-cone when subjected to fluid impact. At the same time, the device can automatically perform telescopic adjustment and can be adjusted according to V-cones of different heights, thereby achieving a good limiting effect and greatly improving practicality.

[0019] 3. The ultrasonic V-cone flowmeter described in the present invention is provided with a coating on the inner and outer surfaces of the V-cone, the inner surface of the tube body, etc., and the coating isolates the medium from the flowmeter, thereby achieving the anti-corrosion effect of the ultrasonic V-cone flowmeter. At the same time, the coating described in the present invention has good high temperature resistance and leveling performance, which can meet the requirements of the ultrasonic V-cone flowmeter for measuring high-temperature gases and liquids. The coating has good adhesion to the inner and outer surfaces of the V-cone, the inner surface of the tube body, etc. under high temperature and high pressure, thereby reducing the probability of the coating detaching during the operation of the flowmeter. At the same time, the good leveling performance of the coating reduces the possibility of the medium adhering to the V-cone flowmeter during operation, thereby improving the measurement accuracy of the V-cone flowmeter. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0021] Figure 2 It is a schematic cross-sectional view of the present invention;

[0022] Figure 3 For the present invention Figure 2 A in the middle is an enlarged structural diagram;

[0023] Figure 4 For the present invention Figure 2 The enlarged structural diagram at B in the middle;

[0024] Figure 5 It is a schematic diagram of the three-dimensional structure of the V-cone of the present invention.

[0025] In the figure: 1. Tube body; 2. Positive pressure head; 3. First pressure pipe; 4. Differential pressure gauge; 5. Integrator; 6. Second pressure pipe; 7. Negative pressure head; 8. Third pressure pipe; 9. V-cone; 10. Mounting seat; 11. Connecting seat; 12. Ultrasonic sensor; 13. First cavity; 14. First limit block; 15. First spring; 16. Second cavity; 17. Second limit block; 18. Second spring; 19. Slot. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] See also Figure 1-5 , the present invention provides a technical solution:

[0028] An ultrasonic V-cone flowmeter with anti-interference and accurate measurement includes a tube body 1, wherein a positive pressure head 2 is provided at the upper end of the tube body 1; the upper end of the positive pressure head 2 is connected to a first pressure-guiding tube 3; a differential pressure gauge 4 is provided on the outside of the first pressure-guiding tube 3; the upper end of the differential pressure gauge 4 is connected to an integrator 5; a second pressure-guiding tube 6 is provided at the right end of the differential pressure gauge 4; the lower end of the second pressure-guiding tube 6 is connected to a negative pressure head 7; the lower end of the negative pressure head 7 is connected to a third pressure-guiding tube 8; a V-cone 9 is fixedly connected to the right side of the third pressure-guiding tube 8; the upper end of the tube body 1 is located at the left end of the positive pressure head 2 and is fixedly connected to a mounting seat 10; a second cavity 16 is opened inside the right end of the tube body 1.

[0029] Preferably, the positive pressure head 2 is fixedly connected to the first pressure-taking tube 3, and the upper end of the positive pressure head 2 is connected to the lower end of the first pressure-taking tube 3; the negative pressure head 7 is fixedly connected to the second pressure-taking tube 6, and the lower end of the second pressure-taking tube 6 is connected to the upper end of the negative pressure head 7; the negative pressure head 7 is fixedly connected to the third pressure-taking tube 8; the lower end of the negative pressure head 7 is connected to the upper end of the third pressure-taking tube 8, which facilitates better fluid data collection.

[0030] Preferably, the mounting base 10 is provided with a connecting base 11; an ultrasonic sensor 12 is provided within the connecting base 11; the ultrasonic sensor 12 is of model FD-V70A; a first cavity 13 is defined within the connecting base 11; a first stopper 14 is provided within the first cavity 13; and a first spring 15 is provided outside the first stopper 14. The first stopper 14 is movably connected to the connecting base 11 via the first spring 15; the end of the first stopper 14, away from the first cavity 13, extends through the mounting base 10 to the outside of the mounting base 10, enabling quick installation and removal of the ultrasonic sensor 12.

[0031] Preferably, a second limit block 17 is provided inside the second cavity 16; a second spring 18 is provided on the outside of the second limit block 17; the second limit block 17 is movably connected to the second limit block 17 through the second spring 18; a slot 19 is provided at the lower end of the second limit block 17; one end inside the slot 19 is in contact with the end face on the right side of the V-cone 9, thereby limiting the V-cone 9 and improving the stability of the V-cone 9.

[0032] Preferably, a plurality of the first cavities 13 , the first limiting blocks 14 and the first springs 15 are respectively distributed about the vertical center line of the connecting seat 11 .

[0033] Preferably, the number of the first cavities 13 , the first limiting blocks 14 and the first springs 15 distributed about the vertical center line of the connecting seat 11 is four.

[0034] Preferably, a plurality of the second cavities 16 , the second limiting blocks 17 , the second springs 18 and the locking slots 19 are respectively distributed about the horizontal center line of the V-cone 9 .

[0035] Preferably, the number of the second cavity 16 , the second limiting block 17 , the second spring 18 and the locking slot 19 distributed about the horizontal center line of the V-cone 9 is four.

[0036] Preferably, the distribution form is annular distribution.

[0037] Preferably, the distribution is in the form of an equidistant annular distribution.

[0038] Preferably, the ultrasonic sensor 12 is electrically connected to the integrator 5 and the differential pressure gauge 4 to facilitate calculation of the flow rate of the fluid.

[0039] Preferably, the inner surface of the tube body 1 , the outer surface of the third pressure-inducing tube 8 , the inner and outer surfaces of the V-cone 9 , and the outer surface of the second limiting block 17 are provided with a coating.

[0040] Preferably, the coating has a thickness of 10-50 microns.

[0041] Preferably, the raw materials of the coating include epoxy resin, organosiloxane, benzoxazine monomer, solvent, and additives.

[0042] Preferably, the epoxy resin is selected from at least one of glycidyl ether epoxy resin, glycidyl amine epoxy resin, and alicyclic epoxy resin.

[0043] Preferably, the glycidyl ether epoxy resin is selected from phenolic epoxy resin, polyol glycidyl ether epoxy resin, and polyhydroxyphenol glycidyl ether epoxy resin.

[0044] Preferably, the novolac epoxy resin is bisphenol A novolac epoxy resin.

[0045] Preferably, the epoxy equivalent of the bisphenol A novolac epoxy resin is 195-230 g / ep.

[0046] Preferably, the bisphenol A novolac epoxy resin is purchased from Hanson Chemical Company in the United States, and the model is EPON SU-8.

[0047] Preferably, the organosiloxane is selected from polyorganosiloxane containing at least one of a phenyl group, an alkoxy group, an alkyl group with 1 to 4 carbon atoms, and an amino group.

[0048] Preferably, the polyorganosiloxane is at least one selected from polymethylphenylsiloxane, phenyltriethoxypolysiloxane, diphenylhexamethylsiloxane, and poly(boron diphenylsiloxane).

[0049] Preferably, the polyorganosiloxane containing phenyl groups is polymethylphenylsiloxane.

[0050] Preferably, the refractive index of the polymethylphenylsiloxane is 1.480-1.495ηD 35 .

[0051] Preferably, the polymethylphenylsiloxane is purchased from Shanghai Resin Factory Co., Ltd.

[0052] Preferably, the weight ratio of the polymethylphenylsiloxane to the bisphenol A novolac epoxy resin is (2-5):10.

[0053] V-cone flowmeters are often used to measure high-temperature liquids and gases. A coating is applied to the contact surface between the flowmeter and the medium to extend the flowmeter's service life. The applicant discovered that using epoxy resin as the primary raw material for the coating can improve the coating's chemical corrosion resistance. However, epoxy resin has poor high-temperature resistance. The applicant discovered that using polyorganosiloxane and epoxy resin together, particularly polymethylphenylsiloxane, with a refractive index of 1.480-1.495η, can improve the performance of the coating. D35 When the weight ratio of polymethylphenylsiloxane to bisphenol A novolac epoxy resin is (2-5):10, the coating can have better high temperature resistance.

[0054] The applicant found that the selection of polymethylphenylsiloxane with different refractive index has a greater impact on the high temperature resistance of the coating. When the refractive index of the selected polymethylphenylsiloxane is 1.480-1.495η D 35 When the coating is coated with water, it shows excellent high temperature resistance. The applicant speculates that the possible reason is that the refractive index is related to the group structure, and the group with a stable structure has a higher bond energy, and the high bond energy improves the high temperature resistance of the coating.

[0055] During experiments, the applicant discovered that increasing the amount of polymethylphenylsiloxane increases the degree of crosslinking with the bisphenol A novolac epoxy resin and the amount of introduced benzene rings. However, excessive benzene rings can increase the rigidity and brittleness of the coating. Decreasing the amount of polymethylphenylsiloxane results in poor high-temperature resistance.

[0056] However, polymethylphenylsiloxane has poor compatibility with epoxy resin, and stratification is likely to occur in the same system.

[0057] Preferably, the polyorganosiloxane further comprises hydroxyl-terminated polydimethylsiloxane.

[0058] Preferably, the molecular weight of the hydroxyl-terminated polydimethylsiloxane is 50-2000.

[0059] Preferably, the weight ratio of the hydroxyl-terminated polydimethylsiloxane, polymethylphenylsiloxane and bisphenol A novolac epoxy resin is (0.5-2.5): (2-5):10.

[0060] During experiments, the applicant discovered that the addition of polydimethylsiloxane improves the toughness of the coating, and that the compatibility of the system is improved when the weight ratio of the hydroxyl-terminated polydimethylsiloxane, polymethylphenylsiloxane, and bisphenol A novolac epoxy resin is (0.5-2.5):(2-5):10. The applicant speculates that this may be due to the introduction of the silane-oxygen bond with a non-polar alkyl chain, which increases the bond length and improves the toughness of the coating. Furthermore, the addition of the hydroxyl-terminated polydimethylsiloxane forms an interpenetrating transition layer between the bisphenol A novolac epoxy resin and the polymethylphenylsiloxane, improving the compatibility of the system.

[0061] The applicant also found that the molecular weight of the hydroxyl-terminated polydimethylsiloxane has a significant impact on the compatibility of the coating. When the molecular weight of the added hydroxyl-terminated polydimethylsiloxane is 50-2000, the compatibility of the coating shows excellent results. The applicant speculates that the possible reason is that the hydroxyl-terminated polydimethylsiloxane with a molecular weight greater than 2000 and the polymethylphenylsiloxane will be entangled with each other, resulting in the agglomeration of the polyorganosilane, which reduces the compatibility of the system.

[0062] However, the addition of polysiloxane will reduce the adhesion between the coating and the flow meter surface.

[0063] Preferably, the benzoxazine monomer is 3,4-dihydro-2H-1,4-benzoxazine-2-methylamine, CAS number: 102908-68-9.

[0064] Preferably, the amount of the benzoxazine monomer added is 25-50 wt % of the polyorganosiloxane.

[0065] Preferably, the amount of the benzoxazine monomer added is 25-35 wt % of the polyorganosiloxane.

[0066] During testing, the applicant discovered that the addition of benzoxazine improves the leveling of the coating and, when added at 25-50% by weight of the polyorganosiloxane, increases the coating's hardness without compromising its toughness. The applicant speculates that this may be due to the ring opening of benzoxazine at high temperatures, forming hydroxyl groups and positively charged carbon ions. These hydroxyl groups can copolymerize with epoxy groups, and the positively charged carbon ions can then attack unsaturated carbon atoms on the benzene ring, increasing the crosslinking degree of the system. The applicant discovered that the benzoxazine selected was 3,4-dihydro-2H-1,4-benzoxazine-2-methylamine, which contains primary amino groups that can further react with other substances in the system, improving the crosslinking degree. Furthermore, the benzoxazine reaction produces no excess small molecules, preventing uneven thickness and porosity during the curing process. This improves the uniformity and density of the coating, further enhancing its leveling.

[0067] However, the applicant discovered that increasing the amount of benzoxazine added accelerates the curing of the epoxy resin, which in turn increases internal stress in the coating and makes it brittle. Decreasing the amount of benzoxazine added fails to improve the coating's leveling properties.

[0068] Preferably, the auxiliary agent is selected from at least one of a silane coupling agent, polyvinyl pyrrolidone, acrylate, a catalyst, and a curing agent.

[0069] Preferably, the silane coupling agent is selected from aminosilane coupling agents; the aminosilane coupling agent is a bisaminosilane coupling agent.

[0070] Preferably, the bisaminosilane coupling agent is N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, purchased from Hengda Zhongcheng Technology Co., Ltd., model number HD-M8253.

[0071] Preferably, the k value of the polyvinyl pyrrolidone is 90-103.

[0072] Preferably, the polyvinyl pyrrolidone is purchased from Jiafeng Chemical Co., Ltd., model K90 (solution).

[0073] Preferably, the weight ratio of the polyvinyl pyrrolidone, aminosilane coupling agent, and bisphenol A novolac epoxy resin is 1:(0.5-1.5):(10-15).

[0074] The applicant discovered that adding hydroxyl-terminated polydimethylsiloxane and polymethylphenylsiloxane to the system reduced the adhesion of the coating to the inner surface of the flowmeter and the inner and outer surfaces of the V-cone. The applicant added an aminosilane coupling agent, which improved the adhesion of the coating to the inner surfaces of the flowmeter and the inner and outer surfaces of the V-cone. The applicant also discovered that adding N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane can further improve the adhesion of the coating. The applicant speculates that the possible reason is that the addition of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane causes the primary and secondary amino groups on it to react with the inner surface of the flowmeter, the inner and outer surfaces of the V-cone, and the epoxy resin, and the methoxy groups on it strengthen the tight bonding between the polyorganosiloxane and the inner surface of the flowmeter and the inner and outer surfaces of the V-cone, thereby improving the adhesion of the coating to the inner surface of the flowmeter and the inner and outer surfaces of the V-cone.

[0075] However, since aminosilane coupling agents are essentially siloxanes and not very compatible with the system, the applicant discovered during experiments that the aminosilane coupling agent may have poor dispersion in this system. However, the applicant unexpectedly discovered that adding polyvinyl pyrrolidone can improve the dispersion performance of the aminosilane coupling agent. The applicant speculates that the possible reason is that polyvinyl pyrrolidone has good compatibility with epoxy novolac resins and also undergoes a grafting reaction with N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, which improves the compatibility of the silane coupling agent with the epoxy novolac resin, improves the dispersion performance of the aminosilane coupling agent in the system, and improves the adhesion of the coating to the inner surface of the flow meter and the inner and outer surfaces of the V-cone.

[0076] The applicant also found that the addition of polyvinyl pyrrolidone can promote the curing of the coating, especially when polyvinyl pyrrolidone with a k value of 90-103 is selected, the effect of promoting the curing of the coating is most obvious. The applicant speculates that the possible reason is that the addition of polyvinyl pyrrolidone with a k value of 90-103 ensures that the polysiloxane and epoxy resin exist in the system in the form of dispersed droplets. During curing, the epoxy resin and the polysiloxane are in full contact, which promotes the curing of the coating. However, the applicant found that an increase in the k value of the added polyvinyl pyrrolidone or an increase in the content of the added polyvinyl pyrrolidone will weaken the contact between the epoxy resin and the polysiloxane, and will also affect the ductility of the coating. When the amount of polyvinyl pyrrolidone added is too small or the k value is reduced, the coating cannot form a coating of a certain thickness on the inner surface of the flowmeter and the inner and outer surfaces of the V-cone, which ultimately affects the overall effect.

[0077] Preferably, the catalyst is selected from at least one of tin octoate, stannous octoate, dioctyltin dilaurate, triethylamine, and triethanolamine.

[0078] Preferably, the catalyst is stannous octoate.

[0079] Preferably, the solvent is selected from at least one of water, toluene, ethanol, ethyl acetate, acetone, dimethylacetamide, methylpyrrolidone, and tetrahydrofuran.

[0080] Preferably, the solvent is a mixed liquid of water and tetrahydrofuran.

[0081] Preferably, the raw materials of the coating include, by weight, 30-70 parts of bisphenol A novolac epoxy resin, 15-30 parts of polymethylphenylsiloxane, 1-18 parts of hydroxyl-terminated polydimethylsiloxane, 10-25 parts of benzoxazine monomer, 1.5-3.5 parts of aminosilane coupling agent, 2-5 parts of catalyst, 2-7 parts of polyvinylpyrrolidone, 40-60 parts of deionized water, and 20-35 parts of tetrahydrofuran.

[0082] Preferably, the method for preparing the coating comprises the following steps:

[0083] (1) Add deionized water, tetrahydrofuran, bisphenol A novolac epoxy resin, benzoxazine monomer, and polyvinyl pyrrolidone into a blender, heat to 50-70° C., and stir evenly;

[0084] (2) adding polymethylphenylsiloxane, hydroxyl-terminated polydimethylsiloxane, aminosilane coupling agent, and catalyst, and stirring evenly;

[0085] (3) Apply the stirred coating to the surface of the component, heat it to above 200°C, maintain it for 5-10 minutes, and then gradually cool it to room temperature to obtain a solidified coating.

[0086] The present invention is described in detail below by way of examples. It is necessary to point out that the following examples are only used to further illustrate the present invention and are not to be construed as limiting the scope of protection of the present invention. Any non-essential improvements and adjustments made by professionals in this field based on the above-mentioned contents of the present invention still fall within the scope of protection of the present invention.

[0087] Example 1

[0088] Provides an anti-interference and accurate ultrasonic V-cone flowmeter, such as Figure 1-5 As stated.

[0089] An ultrasonic V-cone flowmeter with anti-interference and accurate measurement includes a tube body 1, wherein a positive pressure head 2 is provided at the upper end of the tube body 1; the upper end of the positive pressure head 2 is connected to a first pressure-guiding tube 3; a differential pressure gauge 4 is provided on the outside of the first pressure-guiding tube 3; the upper end of the differential pressure gauge 4 is connected to an integrator 5; a second pressure-guiding tube 6 is provided at the right end of the differential pressure gauge 4; the lower end of the second pressure-guiding tube 6 is connected to a negative pressure head 7; the lower end of the negative pressure head 7 is connected to a third pressure-guiding tube 8; a V-cone 9 is fixedly connected to the right side of the third pressure-guiding tube 8; the upper end of the tube body 1 is located at the left end of the positive pressure head 2 and is fixedly connected to a mounting seat 10; a second cavity 16 is opened inside the right end of the tube body 1.

[0090] The positive pressure head 2 is fixedly connected to the first pressure-guiding tube 3, and the upper end of the positive pressure head 2 is connected to the lower end of the first pressure-guiding tube 3; the negative pressure head 7 is fixedly connected to the second pressure-guiding tube 6, and the lower end of the second pressure-guiding tube 6 is connected to the upper end of the negative pressure head 7; the negative pressure head 7 is fixedly connected to the third pressure-guiding tube 8; the lower end of the negative pressure head 7 is connected to the upper end of the third pressure-guiding tube 8, which facilitates better fluid data collection.

[0091] The mounting base 10 is internally provided with a connecting base 11; an ultrasonic sensor 12 is disposed within the connecting base 11; the ultrasonic sensor 12 is model FD-V70A; a first cavity 13 is defined within the connecting base 11; a first stopper 14 is disposed within the first cavity 13; and a first spring 15 is disposed outside the first stopper 14. The first stopper 14 is movably connected to the connecting base 11 via the first spring 15; the end of the first stopper 14, away from the first cavity 13, extends through the mounting base 10 to the outside of the mounting base 10, enabling quick installation and removal of the ultrasonic sensor 12.

[0092] A second limit block 17 is provided inside the second cavity 16; a second spring 18 is provided on the outside of the second limit block 17; the second limit block 17 is movably connected to the second limit block 17 through the second spring 18; a slot 19 is provided at the lower end of the second limit block 17; one end inside the slot 19 contacts the end face on the right side of the V-cone 9, thereby limiting the V-cone 9 and improving the stability of the V-cone 9.

[0093] There are four first cavities 13 , four first limiting blocks 14 and four first springs 15 distributed in an annular pattern at equal intervals about the vertical center line of the connecting seat 11 .

[0094] There are four second cavities 16 , four second limiting blocks 17 , four second springs 18 and four clamping slots 19 distributed in an annular pattern with equal intervals about the horizontal center line of the V-cone 9 .

[0095] The ultrasonic sensor 12 is electrically connected to the integrator 5 and the differential pressure gauge 4 to facilitate calculation of the flow rate of the fluid.

[0096] The working principle of the ultrasonic V-cone flowmeter is as follows: first, the ultrasonic sensor 12 is installed on the mounting base 10 through the connecting base 11, and the first limit block 14 inside the connecting base 11 is connected to the mounting base 10 through the expansion and contraction action of the first spring 15, so that the ultrasonic sensor 12 can be quickly installed and disassembled, which is convenient for replacement and maintenance. When using the flowmeter, when the V-cone 9 located inside the tube body 1 is impacted by the fluid, the second limit block 17 located outside the V-cone 9 limits the V-cone 9, ensuring the stability of the V-cone 9. At the same time, the second limit block 17 can be expanded and contracted by the second spring 18, and can be adjusted according to the height of different V-cones 9, which is convenient for use and adjustment, and greatly improves the stability of the flowmeter during use.

[0097] Example 2

[0098] Provided is an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement. The structure of the ultrasonic V-cone flowmeter is the same as that of Example 1.

[0099] A coating for an ultrasonic V-cone flowmeter that is anti-interference and has accurate measurement is also provided. The coating is located on the inner surface of the tube body 1, the outer surface of the third pressure-inducing tube 8, the inner and outer surfaces of the V-cone 9, and the outer surface of the second limit block 17.

[0100] The raw materials of the coating include, by weight, 60 parts of bisphenol A novolac epoxy resin, 25 parts of polymethylphenylsiloxane, 15 parts of hydroxyl-terminated polydimethylsiloxane, 10 parts of 3,4-dihydro-2H-1,4-benzoxazine-2-methylamine, 2 parts of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, 3 parts of stannous octoate, 4 parts of polyvinylpyrrolidone, 50 parts of deionized water, and 28 parts of tetrahydrofuran.

[0101] The bisphenol A novolac epoxy resin was purchased from Hanson Chemical Company in the United States, with the model number being EPON SU-8.

[0102] Polymethylphenylsiloxane was purchased from Shanghai Resin Factory Co., Ltd., model 255, with a refractive index of 1.480-1.495ηD 35 .

[0103] Hydroxyl-terminated polydimethylsiloxane was purchased from Shanghai MacLean Biochemical Technology Co., Ltd. with the product number: P856624.

[0104] 3,4-Dihydro-2H-1,4-benzoxazine-2-methylamine, CAS number: 102908-68-9.

[0105] N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane was purchased from Hengda Zhongcheng Technology Co., Ltd., model number HD-M8253.

[0106] Polyvinyl pyrrolidone, with a k value of 90-103, was purchased from Jiafeng Chemical Co., Ltd., model K90 (solution).

[0107] The preparation method of the coating comprises the following steps:

[0108] (1) Deionized water, tetrahydrofuran, bisphenol A novolac epoxy resin, 3,4-dihydro-2H-1,4-benzoxazine-2-methylamine, and polyvinylpyrrolidone were added to a blender, heated to 65° C., and stirred evenly;

[0109] (2) adding polymethylphenylsiloxane, hydroxyl-terminated polydimethylsiloxane, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, and stannous octoate, and stirring evenly;

[0110] (3) Apply the stirred coating to the surface of the component, heat it to 205°C, maintain it for 5 minutes, and then gradually cool it to room temperature to obtain a solidified coating.

[0111] Example 3

[0112] Provided is an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement. The structure of the ultrasonic V-cone flowmeter is the same as that of Example 1.

[0113] Also provided is a coating for an ultrasonic V-cone flowmeter that is anti-interference and has accurate measurement, and a method for preparing the coating. The specific implementation method is the same as that of Example 2, except that the raw materials of the coating, measured by weight, include 40 parts of bisphenol A novolac epoxy resin, 18 parts of polymethylphenylsiloxane, 10 parts of hydroxyl-terminated polydimethylsiloxane, 8 parts of 3,4-dihydro-2H-1,4-benzoxazine-2-methylamine, 1.5 parts of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, 2 parts of stannous octoate, 3 parts of polyvinylpyrrolidone, 45 parts of deionized water, and 30 parts of tetrahydrofuran.

[0114] The raw materials in this example are the same as those in Example 2, wherein polymethylphenylsiloxane was purchased from Shanghai Resin Factory Co., Ltd., model number 255, and refractive index of 1.480-1.495ηD 35 .

[0115] Example 4

[0116] Provided is an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement. The structure of the ultrasonic V-cone flowmeter is the same as that of Example 1.

[0117] Also provided is a coating for an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement, and a method for preparing the coating. The specific implementation method is the same as that of Example 2, except that 40 parts of polymethylphenylsiloxane are added to the raw materials of the coating.

[0118] The raw materials in this example are the same as those in Example 2, wherein polymethylphenylsiloxane was purchased from Shanghai Resin Factory Co., Ltd., model number 255, and refractive index of 1.480-1.495ηD 35 .

[0119] Example 5

[0120] Provided is an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement. The structure of the ultrasonic V-cone flowmeter is the same as that of Example 1.

[0121] Also provided is a coating for an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement, and a method for preparing the coating. The specific implementation method is the same as that of Example 2, except that 5 parts of polymethylphenylsiloxane are added to the raw materials of the coating.

[0122] The raw materials in this example are the same as those in Example 2, wherein polymethylphenylsiloxane was purchased from Shanghai Resin Factory Co., Ltd., model number 255, and refractive index of 1.480-1.495ηD 35 .

[0123] Example 6

[0124] Provided is an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement. The structure of the ultrasonic V-cone flowmeter is the same as that of Example 1.

[0125] Also provided is a coating for an ultrasonic V-cone flowmeter with anti-interference and accurate measurement, and a method for preparing the coating. The specific implementation method is the same as that of Example 2, except that the raw material of the coating, polymethylphenylsiloxane, is purchased from Shanghai Resin Factory Co., Ltd., model 250, and the refractive index of polymethylphenylsiloxane is 1.460-1.475ηD 35 .

[0126] The other raw materials in this embodiment are the same as those in Example 2.

[0127] Example 7

[0128] Provided is an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement. The structure of the ultrasonic V-cone flowmeter is the same as that of Example 1.

[0129] Also provided is a coating for an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement, and a method for preparing the coating. The specific implementation method is the same as that of Example 2, except that hydroxyl-terminated polydimethylsiloxane is not added to the raw materials of the coating.

[0130] The raw materials in this example are the same as those in Example 2, wherein polymethylphenylsiloxane was purchased from Shanghai Resin Factory Co., Ltd., model number 255, and refractive index of 1.480-1.495ηD 35 .

[0131] Example 8

[0132] Provided is an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement. The structure of the ultrasonic V-cone flowmeter is the same as that of Example 1.

[0133] Also provided is a coating for an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement, and a method for preparing the coating. The specific implementation method is the same as that of Example 2, except that the raw material of the coating contains 30 parts of hydroxyl-terminated polydimethylsiloxane.

[0134] The raw materials in this example are the same as those in Example 2, wherein polymethylphenylsiloxane was purchased from Shanghai Resin Factory Co., Ltd., model number 255, and refractive index of 1.480-1.495ηD 35 .

[0135] Example 9

[0136] Provided is an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement. The structure of the ultrasonic V-cone flowmeter is the same as that of Example 1.

[0137] Also provided is a coating for an ultrasonic V-cone flowmeter that is anti-interference and accurately measures, and a method for preparing the coating. The specific implementation method is the same as Example 2, except that the hydroxyl-terminated polydimethylsiloxane in the raw material of the coating is purchased from Hongyejie Technology Co., Ltd. and has a molecular weight of 10,000.

[0138] The raw materials in this example are the same as those in Example 2, wherein polymethylphenylsiloxane was purchased from Shanghai Resin Factory Co., Ltd., model number 255, and refractive index of 1.480-1.495ηD 35 .

[0139] Example 10

[0140] Provided is an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement. The structure of the ultrasonic V-cone flowmeter is the same as that of Example 1.

[0141] Also provided is a coating for an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement, and a method for preparing the coating. The specific implementation method is the same as that of Example 2, except that the polyvinyl pyrrolidone in the raw material of the coating is purchased from Jiafeng Chemical Co., Ltd., and the K value is 27.0-32.4.

[0142] The raw materials in this example are the same as those in Example 2, wherein polymethylphenylsiloxane was purchased from Shanghai Resin Factory Co., Ltd., model number 255, and refractive index of 1.480-1.495ηD 35 .

[0143] Example 11

[0144] Provided is an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement. The structure of the ultrasonic V-cone flowmeter is the same as that of Example 1.

[0145] Also provided is a coating for an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement, and a method for preparing the coating. The specific implementation method is the same as that of Example 2, except that the raw material of the coating contains 10 parts of polyvinyl pyrrolidone.

[0146] The raw materials in this example are the same as those in Example 2, wherein polymethylphenylsiloxane was purchased from Shanghai Resin Factory Co., Ltd., model number 255, and refractive index of 1.480-1.495ηD 35 .

[0147] Example 12

[0148] Provided is an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement. The structure of the ultrasonic V-cone flowmeter is the same as that of Example 1.

[0149] Also provided is a coating for an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement, and a method for preparing the coating. The specific implementation method is the same as that of Example 2, except that the raw material of the coating contains 1 part of polyvinyl pyrrolidone.

[0150] The raw materials in this example are the same as those in Example 2, wherein polymethylphenylsiloxane was purchased from Shanghai Resin Factory Co., Ltd., model number 255, and refractive index of 1.480-1.495ηD 35 .

[0151] Example 13

[0152] Provided is an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement. The structure of the ultrasonic V-cone flowmeter is the same as that of Example 1.

[0153] Also provided is a coating for an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement, and a method for preparing the coating. The specific implementation method is the same as that of Example 2, except that the raw materials of the coating include 1 part of polyvinyl pyrrolidone and 5 parts of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane.

[0154] The raw materials in this example are the same as those in Example 2, wherein polymethylphenylsiloxane was purchased from Shanghai Resin Factory Co., Ltd., model number 255, and refractive index of 1.480-1.495ηD 35 .

[0155] Example 14

[0156] Provided is an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement. The structure of the ultrasonic V-cone flowmeter is the same as that of Example 1.

[0157] Also provided is a coating for an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement, and a method for preparing the coating. The specific implementation method is the same as that of Example 2, except that the raw material of the coating contains 5 parts of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane.

[0158] The raw materials in this example are the same as those in Example 2, wherein polymethylphenylsiloxane was purchased from Shanghai Resin Factory Co., Ltd., model number 255, and refractive index of 1.480-1.495ηD 35 .

[0159] Example 15

[0160] Provided is an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement. The structure of the ultrasonic V-cone flowmeter is the same as that of Example 1.

[0161] Also provided is a coating for an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement, and a method for preparing the coating. The specific implementation method is the same as that of Example 2, except that the raw material of the coating contains 2 parts of 3,4-dihydro-2H-1,4-benzoxazine-2-methylamine.

[0162] The raw materials in this example are the same as those in Example 2, wherein polymethylphenylsiloxane was purchased from Shanghai Resin Factory Co., Ltd., model number 255, and refractive index of 1.480-1.495ηD 35 .

[0163] Example 16

[0164] Provided is an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement. The structure of the ultrasonic V-cone flowmeter is the same as that of Example 1.

[0165] Also provided is a coating for an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement, and a method for preparing the coating. The specific implementation method is the same as that of Example 2, except that the raw material of the coating contains 20 parts of 3,4-dihydro-2H-1,4-benzoxazine-2-methylamine.

[0166] The raw materials in this example are the same as those in Example 2, wherein polymethylphenylsiloxane was purchased from Shanghai Resin Factory Co., Ltd., model number 255, and refractive index of 1.480-1.495ηD 35 .

[0167] Example 17

[0168] Provided is an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement. The structure of the ultrasonic V-cone flowmeter is the same as that of Example 1.

[0169] Also provided is a coating for an ultrasonic V-cone flowmeter that is resistant to interference and has accurate measurement, and a method for preparing the coating. The specific implementation method is the same as that of Example 2, except that 3,4-dihydro-2H-1,4-benzoxazine-2-methylamine is not added to the raw materials of the coating.

[0170] The raw materials in this example are the same as those in Example 2, wherein polymethylphenylsiloxane was purchased from Shanghai Resin Factory Co., Ltd., model number 255, and refractive index of 1.480-1.495ηD 35 .

[0171] Performance Testing

[0172] The coatings prepared in Examples 2 to 17 were applied on a 1.5 cm thick steel plate, and the adhesion, impact resistance, and leveling properties of the coatings were measured.

[0173] 1. Adhesion performance.

[0174] The cured coating had a thickness of 30 μm. Adhesion testing of the coating on steel plates was performed according to GB / T 31586.1-2015. The applied force was recorded until the coating peeled off to a degree greater than 50% of the steel plate surface.

[0175] 2. Impact resistance.

[0176] The thickness of the cured coating is 30 μm. The impact resistance of the coating applied on the steel plate is tested with reference to GB / T 1732-2020. The impact resistance of the coating is recorded after being placed at room temperature for 3 days and at 180°C for 3 days after curing. The height at which the coating is damaged when a heavy hammer of the same mass is vertically impacted is recorded.

[0177] 3. Leveling performance.

[0178] The raw materials in the embodiment were mixed evenly according to the coating preparation method, 3g of the coating mixed in step (2) was taken and evenly coated with a thickness of 1.5cm and an area of ​​0.2m 2 The steel plate surface was heated to 205°C and held for 5 minutes, then gradually cooled to allow the coating to cure. The coating thickness was measured using an MProbe20-UVVISNIR film thickness gauge. Ultraviolet light was used to detect pinholes on the coating surface.

[0179] The above test data are recorded in Table 1.

[0180] Table 1

[0181]

[0182] The above description is only a preferred embodiment of the present invention and does not limit the invention in any other form. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. An ultrasonic V-cone flowmeter with anti-interference and accurate measurement, comprising a tube body (1), characterized in that: The upper end of the tube body (1) is provided with a positive pressure head (2); The upper end of the positive pressure head (2) is connected to a first pressure-guiding pipe (3); A differential pressure gauge (4) is provided on the outside of the first pressure-inducing tube (3); The upper end of the differential pressure gauge (4) is connected to an integrator (5); A second pressure-inducing tube (6) is provided at the right end of the differential pressure gauge (4); The lower end of the second pressure-inducing tube (6) is connected to a negative pressure tap (7); The lower end of the negative pressure head (7) is connected to a third pressure-inducing pipe (8); A V-cone (9) is fixedly connected to the right side of the third pressure-inducing tube (8); The upper end of the tube body (1) is located at the left end of the positive pressure head (2) and is fixedly connected to a mounting seat (10); A second cavity (16) is provided inside the right end of the tube body (1); A second limiting block (17) is provided inside the second cavity (16); A second spring (18) is provided on the outer side of the second limiting block (17); The second limiting block (17) is movably connected to the second limiting block (17) via a second spring (18). A slot (19) is provided at the lower end of the second limiting block (17); One end inside the slot (19) contacts the right end surface of the V-cone (9); The inner surface of the tube body (1), the outer surface of the third pressure-inducing tube (8), the inner and outer surfaces of the V-cone (9), and the outer surface of the second limiting block (17) are provided with a coating; The raw materials of the coating include epoxy resin, benzoxazine monomer, polyorganosiloxane, solvent and additive; The addition of benzoxazine to the coating can improve the leveling property of the coating; The polyorganosiloxane includes hydroxyl-terminated polydimethylsiloxane and polymethylphenylsiloxane; The epoxy resin is bisphenol A novolac epoxy resin; The weight ratio of the hydroxyl-terminated polydimethylsiloxane, polymethylphenylsiloxane and bisphenol A novolac epoxy resin is (0.5-2.5): (2-5): 10; The amount of the benzoxazine monomer added is 25-50 wt % of the polyorganosiloxane.

2. The ultrasonic V-cone flowmeter according to claim 1, characterized in that: The positive pressure head (2) and the first pressure-inducing tube (3) are fixedly connected, and the upper end of the positive pressure head (2) and the lower end of the first pressure-inducing tube (3) are connected to each other; The negative pressure head (7) is fixedly connected to the second pressure-inducing tube (6), and the lower end of the second pressure-inducing tube (6) is connected to the upper end of the negative pressure head (7); The negative pressure head (7) is fixedly connected to the third pressure-introducing pipe (8); The lower end of the negative pressure head (7) and the upper end of the third pressure-inducing pipe (8) are connected to each other.

3. The ultrasonic V-cone flowmeter according to claim 1, characterized in that: A connecting seat (11) is provided inside the mounting seat (10); An ultrasonic sensor (12) is provided inside the connecting seat (11); A first cavity (13) is provided inside the connecting seat (11); A first limiting block (14) is provided inside the first cavity (13); A first spring (15) is provided on the outer side of the first limiting block (14); The first limiting block (14) and the connecting seat (11) are movably connected via a first spring (15); One end of the first limiting block (14) away from the first cavity (13) passes through the mounting seat (10) and extends to the outside of the mounting seat (10).

4. The ultrasonic V-cone flowmeter according to claim 3, characterized in that: A plurality of the first cavities (13), the first limiting blocks (14) and the first springs (15) are respectively distributed about the vertical center line of the connecting seat (11).

5. The ultrasonic V-cone flowmeter according to claim 4, characterized in that: A plurality of the second cavities (16), the second limiting blocks (17), the second springs (18) and the clamping slots (19) are respectively distributed about the horizontal center line of the V-cone (9).

6. The ultrasonic V-cone flowmeter according to any one of claims 4-5, characterized in that: The distribution form is an annular distribution.

7. The ultrasonic V-cone flowmeter according to claim 3, characterized in that: The ultrasonic sensor (12), the integrator (5) and the differential pressure gauge (4) are electrically connected.

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