CN212410628U - Ultralow-temperature magnetoelectric revolution speed transducer - Google Patents
Ultralow-temperature magnetoelectric revolution speed transducer Download PDFInfo
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- CN212410628U CN212410628U CN202021541323.9U CN202021541323U CN212410628U CN 212410628 U CN212410628 U CN 212410628U CN 202021541323 U CN202021541323 U CN 202021541323U CN 212410628 U CN212410628 U CN 212410628U
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Abstract
The utility model relates to an ultra-low temperature magnetoelectric revolution speed transducer, which comprises a metal shell, a coil framework, an induction coil, a permanent magnet and a socket, wherein the coil framework, the induction coil, the permanent magnet and the socket are sealed and fixed in the metal shell through low temperature glue, one end of the metal shell is a closed end, and the other end is an installation end with an opening; the coil framework is made of soft magnetic materials and comprises a middle cylinder and end baffles symmetrically arranged at two ends of the middle cylinder, wherein one end baffle is abutted against the closed end of the metal shell; the induction coil is wound on the middle cylinder; the permanent magnet is tightly propped against the other end baffle of the coil framework; the socket seals the mounting end, and the plug-in terminal on the socket is electrically connected with the induction coil through a lead. The ultra-low temperature magnetoelectric revolution speed transducer can accurately complete the measurement of the revolution speed under the low temperature environment.
Description
Technical Field
The utility model relates to a speed sensor technical field, in particular to ultra-low temperature magnetoelectric speed sensor.
Background
The magnetoelectric revolution speed transducer is a sensor which makes the parameter in the oscillating coil change regularly through the rotation of the gear, thereby measuring the regular frequency or amplitude in the coil, has the advantages of convenient installation, self power generation, open magnetic circuit reluctance type and the like, is a magnetoelectric transducer specially used for measuring the revolution speed of the gear, and has wide application in many fields because the working flow of the sensor is simple.
The ultra-low temperature rotation speed sensor is mainly used for measuring the rotation speed of a low-temperature engine rotating mechanism and can also be used for measuring the flow of ultra-low temperature medium (such as a turbine flowmeter), the sensor is generally required to meet the low temperature of-196 ℃ (liquid nitrogen temperature) and even required to reach-269 ℃ (liquid helium temperature), however, under the temperature condition, the problems of material shrinkage deformation and measurement distortion commonly exist in the conventional rotation speed sensor at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an ultra-low temperature magnetoelectric revolution speed transducer to can accurately accomplish the rotational speed under the low temperature state and measure.
In order to achieve the above purpose, the ultra-low temperature magnetoelectric rotation speed sensor provided by the utility model comprises a metal shell, a coil framework, a coil, a permanent magnet and a socket which are sealed and fixed in the metal shell by low temperature glue, wherein,
one end of the metal shell is a closed end, the other end is an installation end with an opening,
the coil framework is made of soft magnetic materials and comprises a middle cylinder and end baffles symmetrically arranged at two ends of the middle cylinder, wherein one end baffle is abutted against the closed end of the metal shell;
the induction coil is wound on the middle cylinder;
the permanent magnet is tightly propped against the other end baffle of the coil framework;
the socket seals the mounting end, and the plug-in terminal on the socket is electrically connected with the induction coil through a lead.
Preferably, the coil framework is made of electrician pure iron, and a middle cylinder in the coil framework and the end baffle are of an integrated structure.
Preferably, the socket is connected with the metal shell in a welding mode.
Preferably, the lead is a polyimide insulated wire, and the lead is connected with the induction coil and the plug terminal in a welding manner.
Preferably, the permanent magnet is cylindric neodymium iron boron magnet or cylindric samarium cobalt permanent magnet, the axial perpendicular to of permanent magnet the end portion baffle, just the permanent magnet is magnetized along self axial.
Preferably, the metal shell is made of stainless steel with non-magnetic conductivity.
Preferably, the induction coil is formed by winding an enameled copper wire.
Preferably, the periphery of casing still is provided with and is used for with the casing complex threaded connection portion of the part that awaits measuring, and is close to threaded connection portion's position still is provided with the boss, the side of boss be provided with be used for with the crowded complex sealed pad of the casing of the part that awaits measuring.
Preferably, the socket is an aviation plug.
Preferably, the induction coil includes a first coil and a second coil independent of each other, and the first coil and the second coil are connected in parallel or in series.
When actually carrying out the product equipment, earlier establish induction coil around on the coil skeleton, then link to each other induction coil through the binding post on lead wire and the socket, and then pour into low temperature glue into the inner chamber of metal casing, the coil skeleton that will wind the coil, permanent magnet and socket are impressed in the inner chamber of metal casing, low temperature glue this moment with not overflowing as the suitable through inserting terminal, then the solidification of stewing so that seal each part in metal casing's inside, treat after the solidification is accomplished, weld socket and metal casing.
Therefore, it can be seen that, the utility model discloses an each part among the ultra-low temperature magnetoelectric revolution speed sensor disclosed all is sealed inside metal casing through low temperature glue, and low temperature glue especially DW-3 low temperature glue can bond various metal and non-metallic material, and it can be at 269 ℃ - +60 ℃ temperature range internal stability, consequently, the utility model discloses an ultra-low temperature magnetoelectric revolution speed sensor disclosed can accurately accomplish the measurement of rotational speed under the low temperature environment.
Drawings
Fig. 1 is a schematic diagram of a partial cross-sectional structure of an ultra-low temperature magnetoelectric rotation speed sensor disclosed in an embodiment of the present invention;
fig. 2 is a schematic diagram of a dual coil connection according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a dual coil connection according to another embodiment of the present invention.
Wherein, 1 is the socket, 2 is low temperature glue, 3 is the lead wire, 4 is the permanent magnet, 5 is coil skeleton, 6 is metal casing, 7 is induction coil, 71 is first coil, 72 is the second coil.
Detailed Description
The utility model discloses a core provides an ultra-low temperature magnetoelectric revolution speed sensor to can accurately accomplish the rotational speed measurement under the low temperature state.
In the field of rotation speed sensor, when the detected ambient temperature reaches-196 ℃ (196 ℃ below zero), namely, it is considered as an ultra-low temperature working environment, please refer to fig. 1, the ultra-low temperature magnetoelectric rotation speed sensor disclosed in the embodiment of the present invention comprises a metal casing 6, a coil frame 5, an induction coil 7, a permanent magnet 4 and a socket 1, wherein the coil frame 5, the induction coil 7, the permanent magnet 4 and the socket 1 are sealed and fixed inside the metal casing 6 through low temperature glue, one end of the metal casing 6 is a closed end, the other end is an installation end with an opening, the coil frame 5, the induction coil 7, the permanent magnet 4 and the socket 1 are all pressed into the metal casing 6 through the opening of the installation end, the coil frame 5 is made of soft magnetic material, as can be clearly seen from fig. 1, the inner cavity of the;
the coil framework 5 comprises a middle cylinder and end baffles symmetrically arranged at two ends of the middle cylinder, the two end baffles are also circular, the center lines of the two end baffles and the middle cylinder are superposed with each other, the center line of the middle cylinder is parallel to the length direction of the metal shell 6 when the coil framework is embedded into the metal shell 6, and one end baffle is abutted against the closed end of the metal shell 6;
the induction coil 7 is wound on the middle column, the permanent magnet 4 is tightly propped against the other end baffle of the coil framework 5, the opening of the mounting end of the socket 1 is plugged, the socket 1 is provided with a plug-in terminal which is connected with a signal processor (such as a chip processor), and the plug-in terminal is electrically connected with the induction coil 7 through a lead 3.
When actually carrying out the product equipment, earlier establish induction coil 7 around coil skeleton 5 on, then link to each other induction coil 7 with the binding post on the socket 1 through lead wire 3, and then pour into low temperature glue into the inner chamber of metal casing 6, coil skeleton 5 around having induction coil 7, in permanent magnet 4 and the inner chamber that socket 1 impressed metal casing 6, low temperature glue this moment with not overflowing as suitable by the plug terminal that does not overflow, then the solidification of stewing so that with each parts seal in metal casing 6's inside, treat after the solidification is accomplished, weld socket 1 and metal casing 6.
Therefore, each part in the ultra-low temperature magnetoelectric speed sensor disclosed in the utility model is sealed and fixed inside the metal shell 6 through low temperature glue, and meanwhile, the socket 1 is also welded and connected with the metal shell 6, the low temperature glue, especially DW-3 low temperature glue produced by Shanghai Huayi resin Co., Ltd can bond various metal and non-metal materials, and can keep stable in the temperature range of-269 ℃ to +60 ℃, therefore, the ultra-low temperature magnetoelectric speed sensor disclosed in the utility model can accurately complete the measurement of the rotating speed under the low temperature environment; of course, DW-1 low-temperature glue and DW-4 low-temperature glue produced by Shanghai Huayi resin Co., Ltd can be adopted on the premise of meeting the use requirements, and low-temperature glue produced by other companies can also be adopted as long as the performance meets the requirements.
The types of soft magnetic materials include various types, the most used soft magnetic materials are iron-silicon alloys and various soft magnetic ferrites, etc., as a preferred mode, the coil bobbin 5 in this embodiment is made of electrical pure iron (DT4 is also called as industrial pure iron), which on one hand functions as the coil bobbin 5 and on the other hand can significantly increase the magnetic flux of the magnetic circuit, so that a sufficiently large induced electromotive force can be generated on the induction coil 7, the middle column and the end baffles in the coil bobbin 5 form an i-shaped structure, and the electrical pure iron is characterized by low coercive force and high magnetic permeability, and in an external magnetic field, the magnetization M and the induction B are large, and when the external magnetic field disappears, M and B basically disappear. Coil skeleton 5's middle part main part and end baffle can be split type structure also formula structure as an organic whole, the embodiment of the utility model provides an in the middle part cylinder and the end baffle formula structure as an organic whole of coil skeleton, this integrated coil skeleton carries out the integrated design with traditional coil skeleton and iron core, satisfies miniaturized structural design demand, improves the magnetic flux of magnetic circuit simultaneously and improves sensor signal strength.
It should be noted that other grades of electrical pure iron, such as DT4A, DT4E, and DT4C, may be used if the signal strength condition is satisfied.
In order to further optimize the scheme, the lead 3 is specifically a polyimide insulated wire, the lead 3 is connected with the induction coil 7 and the plug terminal in a welding mode, polyimide cannot be brittle in liquid helium at the temperature of-269 ℃, and the polyimide has excellent mechanical properties and is insoluble in organic solvents, so that the polyimide can keep stable performance at an ultralow temperature state, and the practical use requirements can be met.
The material of the permanent magnet 4 is not limited to one, for example, the permanent magnet 4 can be a neodymium iron boron magnet or a samarium cobalt permanent magnet, the two permanent magnets 4 have strong magnetic fields, vibration impact resistance and good stability, and can be reliably used under the condition of ultralow temperature strong vibration impact; as shown in fig. 1, the permanent magnet 4 has a cylindrical shape with its axial direction perpendicular to the end stop, and the permanent magnet 4 is magnetized in its axial direction.
Metal casing 6 is as the armor sheath of sensor, choose for use non-magnetic conduction austenite stainless steel machine-shaping, the utility model discloses well preferred adoption 304 grades of stainless steel processing forms, metal casing 6 is overall structure, guarantee that whole sensor does not have interior hourglass phenomenon, it is further, metal casing 6's periphery still is provided with in the casing complex threaded connection portion of the part that awaits measuring, the position that is close to threaded connection portion is provided with the boss, the side of boss is provided with and is used for the sealed pad of the crowded tight complex of casing with the part that awaits measuring, sealed pad can be red copper pad or graphite pad, with satisfy ultra-low temperature, the sealed requirement of ultralow leak rate under the strong vibration impact condition.
The induction coil 7 is formed by winding high-strength enameled copper wires, and the number of turns of the induction coil can be increased in order to enable the sensor to have higher sensitivity. The enameled wire is made of 240-grade aromatic polyimide enameled round copper wire, so that the product can continuously work in an ultralow-temperature environment, furthermore, two groups of enameled copper wires can be wound on the coil framework 5 at the same time, so that the induction coil 7 is provided with two groups of coils which are respectively a first coil 71 and a second coil 72 which are independent of each other, and when the first coil 71 and the second coil 72 are connected in parallel, the reliability of the product can be effectively improved, as shown in fig. 2, when one coil fails, the other coil can work as a standby coil; when the first coil 71 and the second coil 72 are connected in series, the strength of the induced electromotive force can be effectively increased, as shown in fig. 3, which facilitates the detection of the sensor signal.
The socket 1 is preferably an aircraft plug, but if the requirements for the sealing form and the vibration conditions are not high, the socket 1 and the signal processor may be connected by a screw thread or a lead wire.
It is right above the utility model provides an ultra-low temperature magnetoelectric revolution speed sensor has carried out the detailed introduction. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (10)
1. An ultra-low temperature magnetoelectric revolution speed transducer is characterized by comprising a metal shell (6), a coil framework (5), an induction coil (7), a permanent magnet (4) and a socket (1) which are sealed and fixed in the metal shell through low-temperature glue, wherein,
one end of the metal shell (6) is a closed end, and the other end of the metal shell is an installation end with an opening;
the coil framework (5) is made of soft magnetic materials, the coil framework (5) comprises a middle cylinder and end baffles symmetrically arranged at two ends of the middle cylinder, and one of the end baffles abuts against the closed end of the metal shell (6);
the induction coil (7) is wound on the middle cylinder;
the permanent magnet (4) is tightly propped against the other end baffle of the coil framework (5);
the socket (1) seals the mounting end, and the plug-in terminal on the socket (1) is electrically connected with the induction coil (7) through a lead (3).
2. An ultra-low temperature magnetoelectric rotation speed sensor according to claim 1, characterized in that the coil bobbin (5) is made of electrician pure iron, and the middle column and the end baffle in the coil bobbin (5) are of an integrated structure.
3. An ultra-low temperature magnetoelectric rotation speed sensor according to claim 1, characterized in that the socket (1) is welded to the metal case (6).
4. An ultra-low temperature magnetoelectric rotation speed sensor according to claim 1, characterized in that the lead wire (3) is a polyimide insulated wire, and the lead wire (3) is connected with the induction coil (7) and the plug terminal by welding.
5. An ultra-low temperature magnetoelectric tachometric sensor according to claim 1, characterized in that the permanent magnet (4) is a cylindrical neodymium iron boron magnet or a cylindrical samarium cobalt permanent magnet, the axial direction of the permanent magnet (4) is perpendicular to the end shield, and the permanent magnet (4) is magnetized along its own axial direction.
6. The ultra-low temperature magnetoelectric rotation speed sensor according to claim 1, wherein the metal casing (6) is made of stainless steel having non-magnetic conductivity.
7. An ultra-low temperature magnetoelectric rotation speed sensor according to claim 1, wherein the induction coil (7) is wound by an enameled copper wire.
8. An ultra-low temperature magnetoelectric rotation speed sensor according to claim 1, characterized in that the periphery of the metal casing (6) is further provided with a threaded connection portion for fitting with a casing of a component to be measured, and a boss is further provided at a position close to the threaded connection portion, and a seal gasket for caulking fitting with the casing of the component to be measured is provided at a side surface of the boss.
9. An ultra-low temperature magnetoelectric rotation speed sensor according to claim 1, characterized in that the socket (1) is an aviation plug.
10. An ultra-low temperature magnetoelectric rotation speed sensor according to any one of claims 1 to 9, characterized in that the induction coil (7) includes a first coil (71) and a second coil (72) independent of each other, and the first coil (71) and the second coil (72) are connected in parallel or in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021541323.9U CN212410628U (en) | 2020-07-29 | 2020-07-29 | Ultralow-temperature magnetoelectric revolution speed transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021541323.9U CN212410628U (en) | 2020-07-29 | 2020-07-29 | Ultralow-temperature magnetoelectric revolution speed transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212410628U true CN212410628U (en) | 2021-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021541323.9U Active CN212410628U (en) | 2020-07-29 | 2020-07-29 | Ultralow-temperature magnetoelectric revolution speed transducer |
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| Country | Link |
|---|---|
| CN (1) | CN212410628U (en) |
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- 2020-07-29 CN CN202021541323.9U patent/CN212410628U/en active Active
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