CN211697850U - Magnetoelectric revolution speed transducer and revolution speed detecting system - Google Patents
Magnetoelectric revolution speed transducer and revolution speed detecting system Download PDFInfo
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- CN211697850U CN211697850U CN202020663883.5U CN202020663883U CN211697850U CN 211697850 U CN211697850 U CN 211697850U CN 202020663883 U CN202020663883 U CN 202020663883U CN 211697850 U CN211697850 U CN 211697850U
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Abstract
The utility model provides a magnetoelectric revolution speed sensor and rotational speed detecting system, magnetoelectric revolution speed sensor includes the shell, probe and connector, the shell is relatively fixed with rotating, and the length direction of shell extends along the axial that rotates, the probe sets up in the shell, the probe includes the magnetic conduction iron core, induction coil, first permanent magnet and second permanent magnet, first permanent magnet, the magnetic conduction iron core is arranged along the length direction of shell with the second permanent magnet in proper order, first permanent magnet and second permanent magnet have the same magnetic pole orientation of arranging, induction coil centers on the outside of magnetic conduction iron core, in order to form the induction field that is used for measuring the rotational speed that rotates in the side of shell, and induction coil is connected with the connector electricity. The application provides a magnetoelectric tachometric transducer can produce great magnetic flux and change, strengthens the signal of telecommunication of magnetoelectric tachometric transducer output.
Description
Technical Field
The application relates to the technical field of speed sensors, in particular to a magnetoelectric speed sensor and a speed detection system.
Background
Measurement of the rotational speed of a rotating machine is one of the monitored parameters that ensures safe operation of the rotating machine. If the rotating speed parameter monitoring of the rotating machinery fails, the rotating speed of the rotating machinery is out of control, so that the unit stalls, exceeds the speed, even flies, and serious equipment damage accidents are caused. The conventional rotating speed measuring method comprises the following steps: a speed measurement and transmission component (such as a gear disc, a groove and a convex key) is arranged on a main shaft of the rotary machine, a speed measurement sensor (such as a magnetoelectric rotating speed sensor, an eddy current type displacement sensor, a Hall sensor, an inductive sensor and a proximity switch) is arranged in the radial direction of the main shaft of the rotary machine, and the rotating speed of the main shaft of the rotary machine is measured through the speed measurement sensor. Among them, the magnetoelectric revolution speed transducer is widely used due to its simple structure and high reliability.
As shown in fig. 1a and 1b, the conventional magnetoelectric rotation speed sensor includes an induction coil, an iron core, and a permanent magnet. The induction coil is arranged on an iron core (pure iron), one end of the iron core is a permanent magnet, the other end of the iron core is a signal induction surface, and the permanent magnet establishes a stable magnetic field in the space where the induction coil and the iron core are located. Usually, the axis of the sensor is perpendicular to the main shaft, and the signal sensing surface is positioned at the top end of the sensor (namely, the radial direction of the rotating shaft) and is opposite to the speed measuring and transmitting component. The sensor induces the space magnetic field change of the induction coil caused by the rotation of the speed measuring and signaling component, and converts the magnetic field change into a rotating speed pulse electrical signal by utilizing the magnetoelectric induction principle. The rotating machine comprises a main shaft and a shell, the main shaft extends to the outside of the shell, the main shaft and the shell prevent internal liquid from leaking through mechanical sealing, and a speed measuring and signaling component for measuring the rotating speed is installed on the main shaft outside the shell.
However, in some scenarios where the magnetoelectric tachometer sensor is installed in a sleeve parallel to the spindle, the installation gap (6 ± 1.5mm) between the tachometer signal generator on the spindle and the surface of the magnetoelectric tachometer sensor is much larger than the installation gap (1mm) of the conventional magnetoelectric tachometer sensor. Because the installation clearance is larger, the magnetic flux change in the induction coil is small when the magnetoelectric revolution speed sensor measures the revolution speed, and the electric signal output by the magnetoelectric revolution speed sensor is weak.
SUMMERY OF THE UTILITY MODEL
The application provides a magnetoelectric revolution speed sensor and rotational speed detecting system, this magnetoelectric revolution speed sensor can produce great magnetic flux and change, strengthens the signal of telecommunication of magnetoelectric revolution speed sensor output.
First aspect, the application provides a magnetoelectric revolution speed sensor, magnetoelectric revolution speed sensor is used for measuring the rotational speed that rotates the piece, magnetoelectric revolution speed sensor includes the shell, probe and connector, the shell is relatively fixed with rotating the piece, and the length direction of shell extends along the axial that rotates the piece, the probe sets up in the shell, the probe includes the magnetic conduction iron core, induction coil, first permanent magnet and second permanent magnet, first permanent magnet, the magnetic conduction iron core and the second permanent magnet are arranged along the length direction of shell in proper order, first permanent magnet and second permanent magnet have the same magnetic pole orientation of arranging, induction coil centers on the outside of magnetic conduction iron core, in order to form the induction field that is used for measuring the rotational speed that rotates in the side of shell, and induction coil is connected with the connector electricity.
Optionally, the magnetoelectric tachometric transducer that this application provided, first permanent magnet, magnetic core and second permanent magnet set up side by side on the length direction of shell, and first permanent magnet and second permanent magnet set up for magnetic core symmetry.
Optionally, the magnetoelectric tachometric transducer that this application provided, the probe still includes the skeleton body, and the induction coil is around establishing on the skeleton body, and the skeleton body has both ends open-ended cavity, and at least part magnetic core is located the cavity, has the air gap that is used for even magnetic field distribution between cavity and the magnetic core.
Optionally, the magnetoelectric tachometric sensor that this application provided, the quantity of air gap is one, and the air gap passes through magnetoelectric tachometric sensor at the ascending center of shell length direction.
Optionally, the magnetoelectric tachometric sensor that this application provided, the quantity of air gap is a plurality of, and the air gap sets up for magnetoelectric tachometric sensor central symmetry on the shell length direction.
Optionally, according to the magnetoelectric tachometric transducer provided by the application, the first permanent magnet and the second permanent magnet respectively abut against the two ends of the framework body along the length direction of the shell to seal the hollow cavity, and air gaps are formed between the end portions of the first permanent magnet and the magnetic conductive iron core and between the end portions of the second permanent magnet and the magnetic conductive iron core.
Optionally, the magnetoelectric tachometric transducer that this application provided, magnetic conduction iron core include butt portion and grafting portion, and the first end of grafting portion stretches into in the cavity, and the lateral wall of grafting portion and the inside wall butt of cavity, and the second end of grafting portion and the first end of butt portion are connected, and the butt portion is located the skeleton body outside, and the first end of butt portion and the tip butt of skeleton body, the second end and first permanent magnet or the butt of second permanent magnet butt of butt portion.
Optionally, in the magnetoelectric tachometric sensor provided by the present application, one or more air gaps are provided in the length direction of the casing.
Optionally, the magnetoelectric tachometric transducer that this application provided, skeleton body and the coaxial setting of magnetic core.
The second aspect, the application provides a rotational speed detecting system, including can arouse the speed measuring news transmitting part and foretell magnetoelectric tachometric transducer that magnetic field changes, the news transmitting part that tests the speed sets up on waiting to detect the rotation piece, and tests the speed the length direction of news transmitting part along the axial of rotating the piece, magnetoelectric tachometric transducer and the relative setting of news transmitting part that tests the speed.
The application provides a magnetoelectric tachometric transducer and rotational speed detecting system, when the rotating member that has the signalling part that tests the speed keeps away from magnetoelectric tachometric transducer's the induction surface of probe, the induction surface magnetic flux of probe is stronger, and the inside magnetic induction intensity of induction coil is great. When the rotating part with the speed measuring and transmitting component is close to the induction surface of the probe, the magnetic flux of the induction surface of the probe is reduced, the magnetic induction intensity in the induction coil is weakened due to the magnetic conduction effect of the speed measuring and transmitting component, and the magnetic flux penetrating through the induction coil is reduced, so that induction alternating voltage is generated in the induction coil. That is, the magnetoelectric tachometric transducer provided by the embodiment can generate larger magnetic flux change than a conventional magnetoelectric tachometric transducer under the condition of side induction, and the electric signal output by the magnetoelectric tachometric transducer is enhanced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1a and 1b are schematic structural diagrams of a conventional magnetoelectric tachometric transducer;
fig. 2 is a schematic structural diagram of a magnetoelectric tachometric sensor according to an embodiment of the present application;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
fig. 4 is a first schematic view illustrating an installation of a magnetoelectric tachometric sensor according to a first embodiment of the present disclosure;
fig. 5 is a second schematic view illustrating an installation of a magnetoelectric tachometric sensor according to a first embodiment of the present application;
fig. 6 is a schematic view illustrating a magnetic field distribution of a magnetoelectric tachometer according to an embodiment of the present application in a first state;
fig. 7 is a schematic view of a magnetic field distribution of a magnetoelectric tachometer according to an embodiment of the present application in a second state;
fig. 8 is a schematic view of a magnetic field distribution of a magnetoelectric tachometer according to an embodiment of the present application in a third state;
fig. 9 is a schematic view of a magnetic field distribution of a magnetoelectric tachometer according to an embodiment of the present application in a fourth state;
fig. 10 is a schematic diagram of an output waveform of a magnetoelectric tachometer according to an embodiment of the present application;
fig. 11 is a schematic diagram illustrating a relationship between a magnetoelectric tachometer and a rotation speed according to an embodiment of the present application;
fig. 12 is a schematic structural diagram of a magnetoelectric tachometric sensor according to a second embodiment of the present application;
FIG. 13 is an enlarged view of a portion of FIG. 12 at B;
fig. 14 is a schematic installation diagram of a magnetoelectric tachometric sensor according to a second embodiment of the present application;
fig. 15 is a schematic view of a magnetic field distribution of a magnetoelectric tachometer according to a second embodiment of the present application in a first state;
fig. 16 is a schematic view of a magnetic field distribution of a magnetoelectric tachometer according to a second state provided in the second embodiment of the present application.
Description of reference numerals:
100. 400-a magnetoelectric tachometric transducer; 422. 110-an induction coil; 120-iron core; 130-a permanent magnet;
200-a main shaft;
300. 600-a speed measuring and signaling component;
410-a housing; 420-a probe; 421-magnetic conductive iron core; 4211-an abutment; 4212-a plug-in part; 423-a first permanent magnet; 424-a second permanent magnet; 425-a skeleton body; 4251-hollow cavity; 430-a connector; 440-speed measuring sleeve; 450-tail sleeve; 460-a stent; 470-a first ferrule; 480-a metal hose; 490-a second ferrule;
500-a rotating member; 510-installing a sleeve;
700-air gap.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are a subset of the embodiments in the present application and not all embodiments in the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application. 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 application. Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
In the description of the present application, it should be noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning a fixed connection, an indirect connection through intervening media, a connection between two elements, or an interaction between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application.
The terms "first," "second," and "third" (if any) in the description and claims of this application and the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.
Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The rotating machine includes a main shaft 200 and a housing, the main shaft 200 extends to the outside of the housing, the main shaft 200 and the housing prevent the internal liquid from leaking through mechanical sealing, and a speed measuring and transmitting part 300 for measuring the rotating speed is installed on the main shaft 200 outside the housing. Fig. 1a and 1b are schematic structural diagrams of a conventional magnetoelectric tachometer sensor. As shown in fig. 1a and 1b, a conventional magnetoelectric rotation speed sensor 100 includes an induction coil 110, an iron core 120, and a permanent magnet 130. The induction coil 110 is installed on an iron core 120 (also referred to as pure iron), one end of the iron core 120 is opposite to the permanent magnet 130, the other end of the iron core 120 is a signal induction surface, and the permanent magnet 130 establishes a stable magnetic field in a space where the induction coil 110 and the iron core 120 are located. Generally, the axis of the magnetoelectric tachometric transducer 100 is perpendicular to the rotating shaft, and the signal sensing surface of the iron core 120 is located in the radial direction of the spindle 200 and opposite to the tachometer signal transmitter 300. The magnetoelectric tachometric sensor 100 senses the change of the space magnetic field of the induction coil caused by the rotation of the tachometric signal transmitting part 300, and converts the change of the magnetic field into a tachometric pulse electrical signal by utilizing the magnetoelectric induction principle.
However, in some application scenarios, the rotating machinery is required to have extremely high sealing performance, such as a reactor main coolant shield pump and a wet winding pump used in a nuclear power plant, and the inside of the rotating machinery is high-temperature and high-pressure radioactive materials, and the main shaft of the rotating machinery is required to be completely sealed in a pump shell. Therefore, the magnetoelectric tachometric transducer needs to be installed in a sleeve parallel to the main shaft, and the installation gap (6 +/-1.5 mm) between the speed measurement and transmission part on the main shaft and the surface of the magnetoelectric tachometric transducer is far larger than the installation gap (1mm) of the conventional magnetoelectric tachometric transducer. Because the installation clearance is larger, the magnetic flux change in the induction coil is small when the magnetoelectric revolution speed sensor measures the revolution speed, so that the electric signal output by the magnetoelectric revolution speed sensor is weak, and the requirement of a post-stage revolution speed measurement system on the signal to noise ratio is difficult to meet.
In order to solve the above problem, the embodiment of the present application provides a magnetoelectric tachometric sensor, and this magnetoelectric tachometric sensor can produce great magnetic flux and change, strengthens the electrical signal of magnetoelectric tachometric sensor output.
The present application will be described in detail with reference to specific examples.
Example one
Fig. 2 is a schematic structural diagram of a magnetoelectric tachometric sensor according to an embodiment of the present application; FIG. 3 is an enlarged view of a portion of FIG. 2 at A; fig. 4 is a first schematic view illustrating an installation of a magnetoelectric tachometric sensor according to a first embodiment of the present disclosure; fig. 5 is a second schematic view illustrating an installation of a magnetoelectric tachometer according to a first embodiment of the present application. As shown in fig. 2 to 5, an embodiment of the present application provides a magnetoelectric tachometer, in which a magnetoelectric tachometer 400 is used to measure the rotation speed of a rotation member 500, the magnetoelectric tachometer 400 includes a housing 410, a probe 420 and a connector 430, the housing 410 and the rotation member 500 are fixed relatively, the length direction of the housing 410 extends along the axial direction of the rotating member 500, the probe 420 is arranged in the housing 410, the probe 420 comprises a magnetic conductive iron core 421, an induction coil 422, a first permanent magnet 423 and a second permanent magnet 424, the first permanent magnet 423, the magnetic conductive iron core 421 and the second permanent magnet 424 are sequentially arranged along the length direction of the housing 410, the first permanent magnet 423 and the second permanent magnet 424 have the same magnetic pole arrangement direction, the induction coil 422 surrounds the outer side of the magnetic conductive iron core 421, to form an induction magnetic field for measuring the rotation speed of the rotation member 500 at the side of the case 410, the induction coil 422 is electrically connected with the connector 430.
In a specific implementation, the speed measuring and transmitting components 600 are installed on the rotating member 500, the number of the speed measuring and transmitting components 600 is at least one, and the speed measuring and transmitting components 600 are uniformly arranged at intervals. The speed measuring and signaling part 600 is installed at a side surface of the main shaft of the rotation member 500, and an extending direction of the speed measuring and signaling part 600 is parallel to the side surface of the main shaft of the rotation member 500. The speed measuring and signaling component 600 can be a gear, a groove, a convex key or a stainless steel strip embedded in the side surface of the rotating member 500.
The length direction of the casing 410 extends along the axial direction of the rotating member 500, the first permanent magnet 423, the magnetically permeable iron core 421 and the second permanent magnet 424 in the casing 410 are sequentially arranged along the length direction of the casing 410, and the arrangement directions of the magnetic poles of the first permanent magnet 423 and the second permanent magnet 424 are the same. That is, the side surface of the magnetoelectric rotation speed sensor 400 is parallel to the axis of the rotor 500, and the side surface of the probe 420 is a sensing surface of the probe 420 to form an induced magnetic field for measuring the rotation speed of the rotor 500 at the side of the case 410.
When the rotating member 500 having the speed measuring and transmitting part 600 is far away from the sensing surface of the probe 420 of the magnetoelectric tachometric sensor 400, the magnetic flux of the sensing surface of the probe 420 is strong, and the magnetic induction intensity inside the sensing coil 422 is strong. When the rotating member 500 with the speed measuring and transmitting member 600 is close to the sensing surface of the probe 420, the magnetic flux of the sensing surface of the probe 420 is reduced, and due to the magnetic conduction function of the speed measuring and transmitting member 600, the magnetic induction intensity inside the induction coil 422 is weakened, and the magnetic flux passing through the induction coil 422 is reduced, so that an induced alternating voltage is generated in the induction coil 422. That is, the present embodiment provides the magnetoelectric tachometer sensor 400 which can generate a larger magnetic flux variation than the conventional magnetoelectric tachometer sensor 100 under the side induction condition, and enhance the electrical signal output by the magnetoelectric tachometer sensor 400.
The sealing requirement of the rotating machinery is high, and the installation gap (6 mm plus or minus 1.5mm) between the tachometric signaling part 600 on the rotating member 500 and the surface of the magnetoelectric tachometric sensor 400 is much larger than that (1mm) of the conventional magnetoelectric tachometric sensor. In the present embodiment, when the rotating member 500 having the speed measuring and transmitting unit 600 is far away from the sensing surface of the probe 420 of the magnetoelectric tachometric transducer 400, the magnetic flux of the sensing surface of the probe 420 is strong. Therefore, the magnetoelectric tachometric transducer 400 provided by the embodiment can be applied to rotating mechanical equipment with high sealing requirements, such as special machinery of a nuclear power plant reactor main cooling shield pump, a wet winding pump and the like. Special pumps requiring high sealing performance, such as canned pumps and wet-winding pumps.
As shown in fig. 2 and 3, 4 and 5, in order to facilitate the installation of the magnetoelectric tachometric sensor 400, in some embodiments, the axial direction of the probe 420 is parallel to the axial direction of the rotor 500, and is installed in parallel in the installation sleeve 510 of the rotor 500, and the elongated tachometric/transmitter unit 600 is embedded in the rotor 500 along the axial direction.
The magnetoelectric tachometric transducer 400 further comprises a tachometer sleeve 440, a tail sleeve 450 and a support 460, wherein the connector 430 is fixed on the shell of the rotating member 500 through the support 460, the connector 430 is connected with one end of the tachometer sleeve 440 through a first clamp sleeve 470, the other end of the tachometer sleeve 440 is connected with one end of a metal hose 480 through a second clamp sleeve 490, the other end of the metal hose 480 is connected with the shell 410 through the tail sleeve 450, and the probe 420 in the shell 410 is flexibly connected with the connector 430 through a flexible conductor wire via the tail 450, the metal hose 480 and the tachometer sleeve 440.
To facilitate disassembly, the tachometer sleeve 440 is threaded with first and second ferrules 470 and 490, respectively, at both ends.
The magnetic conductive iron core 421 is in a shape of a cylinder, a cuboid, or a cube. The magnetic iron core 421 is made of DT4 electrical steel.
The induction coil 422 uses an enameled wire.
The housing 410 may be made of a non-magnetically conductive metal material such as 304 stainless steel.
In this embodiment, the first permanent magnet 423 and the second permanent magnet 424 are respectively located at two ends of the probe 420, and generate a constant dc magnetic field in the space of the magnetoelectric tachometric sensor 400; the magnetic conductive iron core 421 is located between the first permanent magnet 423 and the second permanent magnet 424, so that the magnetic field is uniformly distributed in the magnetoelectric rotation speed sensor 400 along the axial direction; the induction coil 422 is used to induce a magnetic field change. The first permanent magnet 423 and the second permanent magnet 424 have the same magnetic pole direction, two opposite magnetic poles of the first permanent magnet 423 and the second permanent magnet 424 have opposite polarities, a constant magnetic field with magnetic lines distributed along the axial direction is established between the first permanent magnet 423 and the second permanent magnet 424, and the magnetic lines form a closed magnetic circuit by penetrating through the magnetic conductive iron core 421 and the induction coil 422. When the tacho signaling means 600 of the rotating member 500 passes the probe 420, the magnetic field distribution in space is changed, thereby causing a magnetic flux change inside the induction coil 422, and an induced alternating voltage is generated in the induction coil 422. The magnitude of the voltage is proportional to the mounting gap and the linear velocity, and the frequency of the induction is synchronized with the trigger frequency. The output characteristic of the magnetoelectric rotation speed sensor 400 has the following formula:
f is n x z formula (one)
Formula (two) of K x n/d
In formula (one) and formula (two): n is the rotation speed of the rotating member;
z is the number of teeth of the speed measurement signaling component (or the number of the speed measurement signaling components);
f is the output signal frequency of the magnetoelectric sensor;
v is the peak voltage output by the magnetoelectric sensor;
d is the clearance between the magnetoelectric sensor and the rotating part;
k is a constant associated with the magnetoelectric sensor.
As can be seen from the above equations (one) and (two), the output frequency F of the magnetoelectric sensor is related only to the rotational speed n of the rotating member and the number z of tacho-transmitter units, and the output voltage V is proportional to the rotational speed n of the rotating member, inversely proportional to the gap d between the magnetoelectric sensor and the rotating member, and proportional to the constant K related to the magnetoelectric sensor. The constant K is closely related to magnetic induction intensity and distribution, a magnetic conduction material structure, the number of turns, the length, the diameter and the like of the induction coil, so that the structural design of the first permanent magnet, the second permanent magnet, the magnetic conduction iron core and the induction coil greatly affects the output signal of the magnetoelectric sensor. In order to increase the output signal of the magnetoelectric sensor, a first permanent magnet and a second permanent magnet are arranged according to a measuring mode, and a proper magnetic conduction iron core structure is designed, so that the magnetoelectric sensor generates a larger magnetic flux change rate in a side surface induction mode, the signal-to-noise ratio of the sensor is improved, and the electric signal output by the magnetoelectric revolution speed sensor is enhanced.
With continued reference to fig. 2 and fig. 3, in the present embodiment, the first permanent magnet 423, the magnetically permeable core 421, and the second permanent magnet 424 are arranged in parallel in the length direction of the casing 410, and the first permanent magnet 423 and the second permanent magnet 424 are symmetrically arranged with respect to the magnetically permeable core 421. The first permanent magnet 423 and the second permanent magnet 424 are arranged at two ends of the magnetically permeable iron core 421 in parallel, and the first permanent magnet 423 and the second permanent magnet 424 are symmetrically arranged relative to the magnetically permeable iron core 421, so that a constant magnetic field can be established inside the magnetically permeable iron core 421 and the induction coil 422, and the magnetically permeable iron core 421 between the first permanent magnet 423 and the second permanent magnet 424 can change the magnetic field distribution between the first permanent magnet 423 and the second permanent magnet 424, so that a more uniformly distributed magnetic field is formed inside the induction coil 422 (wherein, magnetic lines of force are distributed along the axis of the induction coil 422).
Fig. 6 is a schematic view illustrating a magnetic field distribution of a magnetoelectric tachometer according to an embodiment of the present application in a first state; fig. 7 is a schematic view of a magnetic field distribution of a magnetoelectric tachometer according to an embodiment of the present application in a second state. As shown in fig. 2 and 3, and fig. 6 and 7, in some embodiments, the probe 420 further includes a skeleton 425, the induction coil 422 is wound around the skeleton 425, and the skeleton 425 and the magnetic core 421 are coaxially disposed. The skeleton 425 has a hollow cavity 4251 with two open ends, at least a part of the magnetic core 421 is located in the hollow cavity 4251, and an air gap 700 for uniform magnetic field distribution is provided between the hollow cavity 4251 and the magnetic core 421.
The first permanent magnet 423, the second permanent magnet 424, the induction coil 422, the magnetically permeable iron core 421 and the skeleton body 425 are encapsulated in the housing 410-by using a non-metallic material such as epoxy resin. The framework 425 is used for fixing the induction coil 422, so that the coil can be wound and installed conveniently, the framework 425 can be made of high-performance nonmetal materials such as PPS (polyphenylene sulfide), and the framework 425 is coaxially installed on the surface of the magnetic conductive iron core 421 through the hollow cavity 4251.
The number of the air gaps 700 is plural, and the air gaps are symmetrically arranged with respect to the center of the magnetoelectric tachometric sensor 400 in the length direction of the case 410.
In this embodiment, the number of the air gaps 700 is two, the first permanent magnet 423 and the second permanent magnet 424 are respectively abutted to two ends of the skeleton body 425 along the length direction of the casing to close the hollow cavity 4251, a first air gap 700 is formed between the first permanent magnet 423 and the end of the magnetic iron core 421, and a second air gap 700 is also formed between the second permanent magnet 424 and the end of the magnetic iron core 421. Wherein, first air gap 700 and second air gap 700 are symmetrically arranged with respect to the center of magnetoelectric tachometric sensor 400 in the length direction of case 410.
It is understood that the number of the magnetic cores 421 may be two or more, and an air gap 700 may also be formed between the magnetic cores 421 in the hollow cavity 4251 of the skeleton body 425; or, the hollow cavity 4251 of the skeleton 425 is provided with the magnetic conductive iron core 421 and the permanent magnet at an interval, and an air gap 700 is formed between the permanent magnet and the magnetic conductive iron core 421.
The magnetoelectric tachometer sensor 400 of fig. 6 and 7 has an air gap 700, fig. 6 shows the magnetic field distribution when the rotor 500 having the tachometer signaling means 600 is far from the sensing surface of the probe 420 of the magnetoelectric tachometer sensor 400, and fig. 7 shows the magnetic field distribution when the rotor 500 having the tachometer signaling means 600 is near to the sensing surface of the probe 420, and as can be seen from fig. 6 and 7, in the structure of the magnetoelectric tachometer sensor 400 having the air gap 700, the magnetic field distribution in the region where the induction coil 422 is located is more uniform, and the magnetic flux changes more when the tachometer signaling means 600 is near, so that the sensor sensitivity is higher.
Fig. 8 is a schematic view of a magnetic field distribution of a magnetoelectric tachometer according to an embodiment of the present application in a third state; fig. 9 is a schematic view of a magnetic field distribution of a magnetoelectric tachometer according to a fourth state provided in an embodiment of the present application. Fig. 8 and 9 illustrate a structure in which the magnetoelectric tachometric sensor 400 is not provided with the air gap 700, fig. 8 illustrates a magnetic field distribution when the rotor 500 having the tachometric signaling means 600 is away from the sensing surface of the probe 420 of the magnetoelectric tachometric sensor 400, and fig. 11 illustrates a magnetic field distribution when the rotor 500 having the tachometric signaling means 600 is close to the sensing surface of the probe 420, and it can be seen from fig. 8 and 9 that in the structure in which the magnetoelectric tachometric sensor 400 is not provided with the air gap 700, a magnetic field distribution in a region where the induction coil 422 is located is not uniform, and a magnetic flux change is small when the tachometric signaling means 600 is close, and thus the sensor sensitivity is.
Fig. 10 is a schematic diagram of an output waveform of a magnetoelectric tachometer according to an embodiment of the present application; fig. 11 is a schematic diagram illustrating a relationship between a magnetoelectric tachometer and a rotation speed according to an embodiment of the present application. As shown in fig. 10 and 11, fig. 10 is a waveform diagram of an output of the magnetoelectric tachometric sensor 400, fig. 11 is a frequency response curve of a peak-to-peak output voltage of the magnetoelectric tachometric sensor 400 varying with a rotation speed, and a peak-to-peak value of a sensor output signal at a rated rotation speed (1500RPM) exceeds 2000mV, so that it can be seen that the magnetoelectric tachometric sensor 400 provided by this embodiment can meet technical requirements of a reactor main coolant pump of a pressurized water reactor nuclear power plant.
Example two
Fig. 12 is a schematic structural diagram of a magnetoelectric tachometric sensor according to a second embodiment of the present application; FIG. 13 is an enlarged view of a portion of FIG. 12 at B; fig. 14 is a schematic view illustrating an installation of a magnetoelectric tachometer according to a second embodiment of the present application. As shown in fig. 12-14, the magnetically permeable core 421 is disposed inside the hollow cavity 4251 along the length of the housing 410 to form an air gap 700. The air gap 700 in the second embodiment is formed in a different manner from that in the first embodiment, the second embodiment has the same structure as that in the first embodiment, and the structure of the second embodiment that is the same as that in the first embodiment is explained in detail in the first embodiment, which is not repeated herein.
In the present embodiment, the number of the air gaps 700 is one, and the air gaps 700 pass through the center of the magnetoelectric tachometer sensor 400 in the length direction of the casing 410. The magnetic conductive iron core 421 includes a contact portion 4211 and a plug portion 4212, a first end of the plug portion 4211 extends into the hollow cavity 4251, an outer side wall of the plug portion 4212 abuts against an inner side wall of the hollow cavity 4251, a second end of the plug portion 4212 is connected with the first end of the contact portion 4211, the contact portion 4211 is located outside the framework 425, the first end of the contact portion 4211 abuts against an end portion of the framework 425, and a second end of the contact portion 4211 abuts against the first permanent magnet 423 or the second permanent magnet 424.
Fig. 15 is a schematic view of a magnetic field distribution of a magnetoelectric tachometer according to a second embodiment of the present application in a first state; fig. 16 is a schematic view of a magnetic field distribution of a magnetoelectric tachometer according to a second state provided in the second embodiment of the present application. As shown in fig. 12 to 14, and fig. 15 and 16, fig. 15 shows the magnetic field distribution when the rotor 500 having the tacho signaling means 600 is far from the sensing surface of the probe 420 of the magnetoelectric tacho sensor 400, and fig. 16 shows the magnetic field distribution when the rotor 500 having the tacho signaling means 600 is near to the sensing surface of the probe 420, and it can be seen from fig. 15 and 16 that in the structure of the magnetoelectric tacho sensor 400 having the air gap 700, the magnetic field distribution in the area where the induction coil 422 is located is more uniform, and the magnetic flux changes more when the tacho signaling means 600 is near, so that the sensor sensitivity is higher.
EXAMPLE III
Referring to fig. 2, 4, 5, 12 and 14, an embodiment of the present application further provides a speed detection system, which includes a speed measurement and transmission component 600 capable of causing a magnetic field to change and the magnetoelectric speed sensor 400 provided in any of the above embodiments, the speed measurement and transmission component 600 is disposed on the rotating member 500 to be detected, and the length direction of the speed measurement and transmission component 600 is along the axial direction of the rotating member 500, and the magnetoelectric speed sensor 400 and the speed measurement and transmission component 600 are disposed opposite to each other.
Specifically, the number of the speed measurement and transmission components 600 is at least one, and the speed measurement and transmission components 600 are uniformly arranged at intervals. The speed measuring and signaling part 600 is installed at a side surface of the main shaft of the rotation member 500, and an extending direction of the speed measuring and signaling part 600 is parallel to the side surface of the main shaft of the rotation member 500. The speed measuring and signaling component 600 can be a gear, a groove, a convex key or a stainless steel strip embedded in the side surface of the rotating member 500. The side surface of the magnetoelectric rotation speed sensor 400 is parallel to the axis of the rotor 500, and the side surface of the probe 420 is a sensing surface of the probe 420 to form an induced magnetic field for measuring the rotation speed of the rotor 500 at the side of the case 410.
When the rotating member 500 having the speed measuring and transmitting part 600 is far away from the sensing surface of the probe 420 of the magnetoelectric tachometric sensor 400, the magnetic flux of the sensing surface of the probe 420 is strong, and the magnetic induction intensity inside the sensing coil 422 is strong. When the rotating member 500 with the speed measuring and transmitting member 600 is close to the sensing surface of the probe 420, the magnetic flux of the sensing surface of the probe 420 is reduced, and due to the magnetic conduction function of the speed measuring and transmitting member 600, the magnetic induction intensity inside the induction coil 422 is weakened, and the magnetic flux passing through the induction coil 422 is reduced, so that an induced alternating voltage is generated in the induction coil 422. That is, the present embodiment provides the magnetoelectric tachometer sensor 400 that can generate a larger magnetic flux variation than the conventional magnetoelectric tachometer sensor 100 under the side induction condition.
The sealing requirement of the rotating machinery is high, and the installation gap (6 mm plus or minus 1.5mm) between the tachometric signaling part 600 on the rotating member 500 and the surface of the magnetoelectric tachometric sensor 400 is much larger than that (1mm) of the conventional magnetoelectric tachometric sensor. In the present embodiment, when the rotating member 500 having the speed measuring and transmitting unit 600 is far away from the sensing surface of the probe 420 of the magnetoelectric tachometric transducer 400, the magnetic flux of the sensing surface of the probe 420 is strong. Therefore, the magnetoelectric tachometric transducer 400 provided by the embodiment can be applied to rotating mechanical equipment with high sealing requirements, such as special machinery of a nuclear power plant reactor main cooling shield pump, a wet winding pump and the like. Special pumps requiring high sealing performance, such as canned pumps and wet-winding pumps.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A magnetoelectric rotation speed sensor is characterized in that the magnetoelectric rotation speed sensor is used for measuring the rotation speed of a rotating member, the magnetoelectric revolution speed transducer comprises a shell, a probe and a connector, wherein the shell and the rotating piece are relatively fixed, the length direction of the shell extends along the axial direction of the rotating part, the probe is arranged in the shell, the probe comprises a magnetic conductive iron core, an induction coil, a first permanent magnet and a second permanent magnet, the first permanent magnet, the magnetic conductive iron core and the second permanent magnet are sequentially arranged along the length direction of the shell, the first permanent magnet and the second permanent magnet have the same magnetic pole arrangement direction, the induction coil surrounds the outer side of the magnetic conductive iron core, so as to form an induction magnetic field for measuring the rotating speed of the rotating member at the side of the housing, and the induction coil is electrically connected with the connector.
2. The magnetoelectric rotation speed sensor according to claim 1, wherein the first permanent magnet, the magnetically permeable core, and the second permanent magnet are juxtaposed in a length direction of the casing, and the first permanent magnet and the second permanent magnet are symmetrically disposed with respect to the magnetically permeable core.
3. The magnetoelectric rotation speed sensor according to claim 1, wherein the probe further comprises a frame body, the induction coil is wound on the frame body, the frame body has a hollow cavity with two open ends, at least a part of the magnetic conductive iron core is located in the hollow cavity, and an air gap for uniform magnetic field distribution is provided between the hollow cavity and the magnetic conductive iron core.
4. The magnetoelectric tachometer of claim 3 wherein the number of the air gaps is one, and the air gap passes through a center of the magnetoelectric tachometer in a length direction of the case.
5. The magnetoelectric tachometer of claim 3 wherein the number of the air gaps is plural, and the air gaps are symmetrically disposed with respect to a center of the magnetoelectric tachometer in a length direction of the case.
6. The magnetoelectric rotation speed sensor according to claim 3, wherein the first permanent magnet and the second permanent magnet abut against both ends of the skeleton body in the length direction of the casing respectively to close the hollow cavity, and the air gap is formed between the first permanent magnet and the end portion of the magnetically permeable iron core, and between the second permanent magnet and the end portion of the magnetically permeable iron core.
7. The magnetoelectric rotation speed sensor according to claim 6, wherein the magnetically conductive iron core includes a contact portion and an insertion portion, a first end of the insertion portion extends into the hollow cavity, an outer side wall of the insertion portion abuts against an inner side wall of the hollow cavity, a second end of the insertion portion is connected with a first end of the contact portion, the contact portion is located outside the frame body, a first end of the contact portion abuts against an end portion of the frame body, and a second end of the contact portion abuts against the first permanent magnet or the second permanent magnet.
8. A magnetoelectric rotation speed sensor according to any one of claims 3 to 7, wherein one or more of the air gaps are provided in a length direction of the casing.
9. The magnetoelectric rotation speed sensor according to any one of claims 3 to 7, wherein the skeleton body is disposed coaxially with the magnetically permeable iron core.
10. A rotation speed detecting system, comprising a speed measuring and transmitting component capable of inducing a magnetic field to change and the magnetoelectric rotation speed sensor according to any one of claims 1 to 9, wherein the speed measuring and transmitting component is disposed on a rotating member to be detected, and the length direction of the speed measuring and transmitting component is along the axial direction of the rotating member, and the magnetoelectric rotation speed sensor and the speed measuring and transmitting component are disposed opposite to each other.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020663883.5U CN211697850U (en) | 2020-04-27 | 2020-04-27 | Magnetoelectric revolution speed transducer and revolution speed detecting system |
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| CN202020663883.5U CN211697850U (en) | 2020-04-27 | 2020-04-27 | Magnetoelectric revolution speed transducer and revolution speed detecting system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112379117A (en) * | 2020-11-16 | 2021-02-19 | 北京理工大学 | Magnetoelectric rotation angular velocity and angular acceleration integrated sensor |
| CN112968636A (en) * | 2021-03-12 | 2021-06-15 | 江苏雷利电机股份有限公司 | Direct current motor driving device, direct current motor assembly, lifting actuator and running machine |
-
2020
- 2020-04-27 CN CN202020663883.5U patent/CN211697850U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112379117A (en) * | 2020-11-16 | 2021-02-19 | 北京理工大学 | Magnetoelectric rotation angular velocity and angular acceleration integrated sensor |
| CN112968636A (en) * | 2021-03-12 | 2021-06-15 | 江苏雷利电机股份有限公司 | Direct current motor driving device, direct current motor assembly, lifting actuator and running machine |
| CN112968636B (en) * | 2021-03-12 | 2023-09-29 | 江苏雷利电机股份有限公司 | DC motor driving device, DC motor assembly, lifting actuator and running machine |
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Address after: 214400 building D2, Cyberport, Chuangzhi Industrial Park, 201 Jinshan Road, Jiangyin City, Jiangsu Province Patentee after: JIANGSU LIHE I&C TECHNOLOGY CO.,LTD. Patentee after: Shanghai Nuclear Engineering Research and Design Institute Co.,Ltd. Address before: 214400 building D2, Cyberport, Chuangzhi Industrial Park, 201 Jinshan Road, Jiangyin City, Jiangsu Province Patentee before: JIANGSU LIHE I&C TECHNOLOGY CO.,LTD. Patentee before: SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE Co.,Ltd. |