阅读说明：本技术 一种流量传感器 (Flow sensor ) 是由 赵梓伯 赵立明 赵丹 郝锐 于福星 于 2020-12-25 设计创作，主要内容包括：一种流量传感器,其特征在于,包括带有外螺纹的底座焊接于开孔的被测管路上,主体通过压盖螺母固定于底座上,主体和底座之间设有密封圈,压盖螺母通过主体压紧密封圈,密封圈发生变形,在底座与主体之间形成密封；霍尔元件安装于主体中,紧贴在主体上且靠近叶轮方向的内壁上,信号电路安装于霍尔元件之后,霍尔元件和信号电路通过环氧树脂密封胶密封固定于主体中,橡胶堵头完成对内部脆弱电子元件的二次密封同时保护线缆根部；霍尔元件为开关型,输出为数字信号；叶轮通过塑料注塑加工而成,磁钢位于叶轮顶部,整体埋入叶轮中,磁钢呈圆柱形且只有一个端面暴露在外,磁钢在注塑时以金属嵌件的形式进入到叶轮中,磁钢埋入叶轮中。(A flow sensor is characterized by comprising a base with external threads, a main body, a sealing ring and a sealing ring, wherein the base is welded on a pipeline to be measured, the opening of the pipeline is provided with an opening; the Hall element is arranged in the main body, clings to the main body and is close to the inner wall of the impeller, the signal circuit is arranged behind the Hall element, the Hall element and the signal circuit are sealed and fixed in the main body through epoxy resin sealant, and the rubber plug completes secondary sealing on an internal fragile electronic element and protects the root of the cable; the Hall element is of a switch type, and the output is a digital signal; the impeller is formed by plastic injection molding, the magnetic steel is positioned at the top of the impeller and is integrally embedded into the impeller, the magnetic steel is cylindrical, only one end face of the magnetic steel is exposed outside, the magnetic steel enters the impeller in a metal insert mode when injection molding is carried out, and the magnetic steel is embedded into the impeller.)

1. A flow sensor is characterized by comprising a base with external threads, a main body, a sealing ring and a sealing ring, wherein the base is welded on a pipeline to be measured, the opening of the pipeline is provided with an opening; the Hall element is arranged in the main body, clings to the main body and is close to the inner wall of the impeller, the signal circuit is arranged behind the Hall element, the Hall element and the signal circuit are sealed and fixed in the main body through epoxy resin sealant, and the rubber plug completes secondary sealing on an internal fragile electronic element and protects the root of the cable; the Hall element is of a switch type, and the output is a digital signal; the impeller is formed by plastic injection molding, the magnetic steel is positioned at the top of the impeller and is integrally embedded into the impeller, the magnetic steel is cylindrical, only one end face of the magnetic steel is exposed outside, the magnetic steel enters the impeller in a metal insert mode during injection molding, and the magnetic steel is embedded into the impeller; the middle of the impeller is provided with an injection molding shaft hole, the rotating shaft penetrates through the middle of the impeller to support the impeller, the rotating shaft is made of corrosion-resistant metal materials and is subjected to nitriding treatment and grinding processing, and the rotating shaft is connected with the shaft sleeve in a matched mode.

2. A measuring method of a flow sensor is characterized in that when liquid passes through a pipeline to be measured, an impeller rotates under the action of liquid flow, when magnetic steel passes through a Hall element, voltage signals are induced in the Hall element, the signals are processed by a signal circuit and then output to the outside, the flow of the pipeline to be measured is proportional to the pulse number output by the signal circuit, the relationship among the pipe diameter, the flow and the frequency is obtained by calibrating a flowmeter under a standard flowmeter in advance, a proportionality coefficient is calculated, and the flow can be calculated through the pulse number and the proportionality coefficient during measurement.

Technical Field

The invention relates to a flow sensor, and belongs to the technical field of sensors.

Background

The traditional flow sensor main part that is widely used at present is mostly stainless steel or cast iron material, and corrosion resistance is poor, and the complex price of processing technology is higher, and the easy welding deformation of course of working influences the precision, and the metal main part can disturb hall element's signal reception simultaneously. Traditional flow sensor requires higher to quality of water, is blocked by impurity, silt of aquatic easily, and the reliability is poor, needs often to dismantle and washs the maintenance. The present invention improves upon the deficiencies of conventional flow sensors.

Disclosure of Invention

In order to solve the defects and shortcomings, the invention provides a flow sensor.

The technical scheme adopted by the invention for solving the technical problem is as follows:

a flow sensor comprises a base with external threads welded on a tested pipeline with an opening, a main body fixed on the base through a gland nut, a sealing ring arranged between the main body and the base, the gland nut pressing the sealing ring through the main body, the sealing ring deforming to form a seal between the base and the main body; the Hall element is arranged in the main body, clings to the main body and is close to the inner wall of the impeller, the signal circuit is arranged behind the Hall element, the Hall element and the signal circuit are sealed and fixed in the main body through epoxy resin sealant, and the rubber plug completes secondary sealing on an internal fragile electronic element and protects the root of the cable; the Hall element is of a switch type, and the output is a digital signal; the impeller is formed by plastic injection molding, the magnetic steel is positioned at the top of the impeller and is integrally embedded into the impeller, the magnetic steel is cylindrical, only one end face of the magnetic steel is exposed outside, the magnetic steel enters the impeller in a metal insert mode during injection molding, and the magnetic steel is embedded into the impeller; the middle of the impeller is provided with an injection molding shaft hole, the rotating shaft penetrates through the middle of the impeller to support the impeller, the rotating shaft is made of corrosion-resistant metal materials and is subjected to nitriding treatment and grinding processing, and the rotating shaft is connected with the shaft sleeve in a matched mode.

A flow sensor measuring method includes inducing voltage signal in Hall element when magnetic steel passes through Hall element, processing signal by signal circuit and outputting signal to outside, calibrating flowmeter under standard flowmeter to obtain relationship of pipe diameter, flow and frequency, calculating proportional coefficient and calculating flow rate by pulse number and proportional coefficient.

The invention has the following beneficial effects: the main body and the impeller are produced and injection molded by adopting a mold, so that the production efficiency is greatly improved while the precision is improved, and the processing cost is reduced; the non-metallic material is selected, so that the corrosion resistance is improved, the service life is prolonged, the maintenance frequency is reduced, the environmental adaptability and the reliability of the product are improved, and the interference on signal receiving is reduced; the problem of silt impurity in the water is effectively solved, the rotation is sensitive, the starting flow is small, and the blockage is not easy to occur; the top rubber end cap plays a role in protecting the cable.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a cross-sectional view of the present invention;

in the figure: 1. a pipeline to be tested; 2. a base; 3. a gland nut; 4. a seal ring; 5. a rubber plug; 6. a main body; 7. a signal circuit; 8. a Hall element; 9. an impeller; 10. a shaft sleeve; 11. turning the column; 12. magnetic steel; 13. and (4) epoxy resin sealant.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "horizontal", "inside", "outside", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Example 1

As shown in fig. 1, a flow sensor comprises a base 2 with external threads welded on a perforated pipeline 1 to be measured, a main body 6 fixed on the base 2 through a gland nut 3, a sealing ring 4 between the main body 6 and the base 2, the gland nut 3 compressing the sealing ring 3 through the main body 6, the sealing ring 3 deforming to form a seal between the base 2 and the main body 6 to prevent the leakage of pressure liquid in the pipeline 1 to be measured, the gland nut 3 being manually detachable and mountable; the Hall element 8 is arranged in the main body 6, clings to the main body 6 and is close to the inner wall of the impeller 9, the signal circuit 7 is arranged behind the Hall element 10 and is responsible for shaping and outputting a signal output by the Hall element 10, the Hall element 10 and the signal circuit 7 are fixed in the main body 6 in a sealing mode through epoxy resin sealant 13 and are output to the outside after being processed by the signal circuit 7, and the rubber plug 5 completes secondary sealing on an internal fragile electronic element and protects the root of a cable; the Hall element is of a switch type, and the output is a digital signal; the impeller 9 is formed by plastic injection molding, the magnetic steel 12 is positioned at the top of the impeller 9 and is integrally embedded into the impeller 9, the magnetic steel 12 is cylindrical, only one end face of the magnetic steel 12 is exposed outside, the magnetic steel 12 enters the impeller 9 in a metal insert mode during injection molding, subsequent assembly procedures are reduced, the overall strength is increased, the accident that the magnetic steel 12 is separated from the impeller 9 due to temperature, vibration, impact and high-speed operation is greatly reduced, the magnetic steel 12 is embedded into the impeller 9, the probability that the magnetic steel 12 is struck by silt in liquid flow, lost magnetism and damaged is reduced, and meanwhile, the plastic is softer relative to metal and can be slightly deformed when being struck by the silt to buffer and absorb the impact energy, so that the impeller 9 and the magnetic steel 12 cannot be damaged more; the middle shaft hole that is equipped with the injection molding of impeller 9, pivot 11 passes from the middle of impeller 9 in order to support impeller 9, pivot 11 is corrosion-resistant metal material, through nitriding treatment and abrasive machining, guarantee the high rigidity and the high finish of pivot 11, make impeller 9 running resistance reduce greatly, reduced the start-up flow, enlarged the measurement lower limit of flowmeter, pivot 11 and axle sleeve 10 cooperation are connected, for traditional carbide cooperation, improved the wearing and tearing life-span, also reduced the processing degree of difficulty simultaneously.

The working process is as follows: when liquid passes through the pipeline 1 to be measured, the impeller 9 rotates under the action of the liquid flow, when the magnetic steel 12 passes through the Hall element 10, a voltage signal is induced in the Hall element 10, the signal is processed by the signal circuit 7 and then is output outwards, the flow rate of the pipeline 1 to be measured is proportional to the pulse number output by the signal circuit 7, the relation among the pipe diameter, the flow rate and the frequency is obtained by calibrating the flowmeter under a standard flowmeter in advance, a proportionality coefficient is calculated, and the flow rate can be calculated through the pulse number and the proportionality coefficient during measurement.

The invention mainly completes the main collection function by the Hall chip device, and the Hall chip device can generate an electronic switch action when approaching to the magnetic article. According to the invention, the Hall switch device is fixed on the circuit board, and finally the circuit board is fixed in the main body of the flowmeter, the magnetic steel is embedded on each impeller of the impeller, when the impeller rotates, the distance between the magnetic steel and the Hall chip device can be changed, and then the Hall chip device can output a series of switching actions. A voltage is applied to the Hall chip device through an external circuit, the Hall chip device can output pulse type voltage change along with the action of a switch, the pulse voltage is output by the voltage pulse of the flowmeter, and the water flow speed is calculated through the change rate of the pulse voltage.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.