Giant magnetostrictive driver and high-speed electromagnetic valve driven thereby

Abstract

The invention discloses a giant magnetostrictive driver and a high-speed electromagnetic valve driven thereby. A magnetostrictive rod (14) of the driver is arranged in a thermal compensation tube with the minimum diameter, a magnetostrictive tube is sleeved outside the thermal compensation tube, and the thermal compensation tube is sleeved outside the magnetostrictive tube; in the same way, a coil frame (7) is sleeved outside the magnetostrictive tube on the outermost layer, a coil (15) is wound on the coil frame (7), and a lead of the coil (15) is led out of a lead hole (11) on a magnetic shell (16) and connected with an external driving circuit; all mounted components are arranged in the magnetic shell (16); the open end of the magnetic shell (16) is sealed by a magnetic end cover (12); a central convex column of the inner surface of the magnetic end cover (12) is inserted into circular holes formed at closed ends of all the thermal compensation tubes; and a magnetic output rod (17) is arranged in the circular hole formed at the closed end of the magnetic shell (16) and contacted with one end of the magnetostrictive rod (14) arranged in the magnetic shell (16).

Description

technical field [0001] The invention relates to the application of a giant magnetostrictive material and a driver device thereof, belongs to the field of micro-drive technology, and is particularly suitable for being used as a driver device for a high-speed electromagnetic valve, an electro-hydraulic servo valve, a proportional valve, and the like. Background technique [0002] At present, the drivers of high-speed solenoid valves, electro-hydraulic servo valves, proportional valves, etc. are usually made of electromagnets or piezoelectric crystal materials; for this kind of hydraulic valves, the common problem is that their response time is long, generally several In order to improve its fast response, more ampere-turns and higher driving voltage are required, so the coil generates serious heat, complex structure, large volume, and high power consumption, which limits further improvement of its frequency response. The giant magnetostrictive material (Terfemol-D) is a new ty...

AI Technical Summary

Problems solved by technology

[0002] At present, the drivers of high-speed solenoid valves, electro-hydraulic servo valves, proportional valves, etc. are usually made of electromagnets or piezoelectric crystal materials; for this kind of hydraulic valves, the common problem is that their response time is long, generally several In order to improve its fast response, more ampere-turns and higher driving voltage are required, so that the coil generates serious heat, complex structure, large volume, and large power consumption, which limits further improvement of its frequency response.

However, compared with the displacement requirements of the hydraulic valve for the spool, the magnetostrictive strain of the giant magnetostrictive material is still too small. If the giant magnetostrictive material is completely used to achieve the required displacement, a longer giant magnetostrictive material is required. The telescopic material rod causes the overall length of the valve to be long and the volume is too large, which limits its practical application; if an amplification mechanism is used to amplify the micro-displacement, such as the patent publication of patent No. ZL200820233841.7 and patent No. CN200320110969.1 An amplifying mechanism for amplifying the displacement by 8 to 10 through a lever is proposed; since the amplifying mechanism is used for amplifying the displacement, the output force will be reduced by a corresponding multiple while amplifying the displacement. Therefore, although the opening time of this type of valve is very short, it can Because the corresponding pre-tightening force is small (generally, when the pre-pressure of giant magnetostrictive materials is about 10MPa, the magnetostrictive coefficient reaches the maximum, and the straight diameter of the rod is generally about 10mm, the corresponding spring pre-tightening The force can only be about 78.5N), which will cause the closing speed of the spool to decrease and the reset time will be longer

In addition, patent No. ZL200820233841.7 and CN200320110969.1 patents, when the coil heats up and the giant magnetostrictive material expands and expands due to the lack of corresponding thermal displacement compensation device, the initial position of the driver will change with the super magnetostrictive material. The temperature of the magnetostrictive material changes, resulting in a change in the position of the valve core, which affects the normal use of the valve

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