Magnetic field generating device with adjustable air gap
By using elastic parts and adjustment mechanisms in the magnetic field generation device to balance the magnetic suction and elastic force between the magnets, combined with guide columns and magnetic materials, the problem of large adjustment resistance when the magnet is close, and convenient adjustment of air gaps and magnetic field is achieved stability.
Patent Information
- Application Number
- CN202420938475.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-04-30
AI Technical Summary
When the two magnets are close to each other, the existing magnetic field generator has a large resistance to the magnetic field space adjustment handle, resulting in inconvenient air gap adjustment.
The elastic member and the adjustment mechanism are used to dynamically balance the elastic force of the elastic member and the magnetic suction force between the magnet, so as to reduce the resistance during air gap adjustment, and to optimize the magnetic field closure with guide columns and magnetic conductive materials to achieve convenient adjustment of the air gap.
Reduce adjustment resistance when the air gap is small, improves operational ease, ensures accurate adjustment of the distance between magnets, and does not affect the stability of the magnetic field.
Smart Images
Figure CN222212841U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a magnetic field generating device with adjustable air gap. Background Art
[0002] Chinese patent application number 202322217558.2 discloses a magnetic field generating device, which includes two oppositely arranged side yoke plates, adjacent sides of the two side yoke plates are fixed with excitation coils, and the side yoke plates are equipped with a magnetic field space adjustment handle. The excitation coils are energized to form an electromagnet and generate a magnetic field. The air gap between the two electromagnets is adjusted by rotating the magnetic field space adjustment handle.
[0003] In order to reduce the experimental cost, the magnetic field space adjustment handle is usually rotated manually. However, when the two magnets are close to each other, due to the influence of the magnetic force between the two magnets, the resistance of the magnetic field space adjustment handle is large, and the air gap adjustment is very inconvenient. Utility Model Content
[0004] The utility model aims to provide an air gap adjustable magnetic field generating device which can make the resistance of air gap adjustment smaller when the air gap is small and is convenient for adjustment when the air gap is small.
[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a magnetic field generating device with adjustable air gap, comprising two parallel and spaced fixing parts, a magnet placement space for making way for the magnet is provided between the fixing parts, the two fixing parts are respectively fixed to a magnet, elastic parts and an adjustment mechanism for adjusting and maintaining the distance between the two fixing parts are provided on opposite sides of the magnet placement space, the two ends of the elastic part are supported between the two fixing parts, the elastic force direction of the elastic part is parallel to or the same as the magnetization direction of the two magnets, and the two fixing parts have a tendency to move away from each other under the action of the elastic part.
[0006] When the utility model is used, two magnets are respectively fixed on a fixing part and the two magnets are adjacent to each other, and then the distance between the two fixing parts is adjusted by the adjusting mechanism, so as to achieve the adjustment of the distance between the two magnets.
[0007] The corresponding elastic member is selected according to the magnetic force of the magnet, and the elastic force of the elastic member of the utility model is dynamically balanced with the magnetic attraction force between the two magnets, that is, within the adjustable air gap, the spring force and the attraction force between the two magnets maintain a basically consistent difference. When the air gap is small (when the resistance is large or it is difficult to control the manual movement when the magnet is moved under the conventional scheme), the spring force is greater than the magnetic attraction force, thereby facilitating the resetting of the air gap, making the adjustment between the two fixed parts of the utility model more convenient, and facilitating manual adjustment by the operator when the two magnets are close (when the magnetic attraction force is large).
[0008] The elastic part of the utility model is not located between the two magnets, and the metal elastic part will not affect the magnetic field of the magnet itself; the adjustment mechanism of the utility model can be fixed by bolts and nuts to realize multiple parts relatively fixed between the two fixed parts, or it can be a screw transmission assembly, or it can be a linear telescope such as an electric push rod. Among them, grooves can be dug on the fixed part to limit the translation of the magnet, or the position of the magnet can be limited by fasteners and pressure plates, wherein the utility model device can generate a parallel magnetic field. The magnet of the utility model can be a permanent magnet, which is simple to generate a magnetic field, small in size, strong and stable in magnetic field, does not require power supply, and does not need to consider heating problems.
[0009] Preferably, the fixing part is detachably fixed with a pressing plate by a fastener, and a space for limiting the magnet is formed between the pressing plate and the end surface of the fixing part. The pressing plate and the fastener can be made of plastic or rubber, or other non-magnetic conductive materials.
[0010] Preferably, the pressing plate is annular, so that the end surface of the magnet confined between the fixing portion and the pressing plate is partially exposed. By providing a hole groove in the middle of the pressing plate, the negative impact on the magnetic field of the magnet can be further reduced.
[0011] Preferably, a stopper structure that cooperates with each other is formed between the pressing plate and the magnet. A barrier extending along the elastic force direction of the elastic member can be provided on the pressing plate to limit the translation of the magnet, that is, to limit the movement of the magnet by positioning the outer edge.
[0012] Preferably, each of the adjustment mechanisms comprises an adjustment screw and at least one adjustment nut, one of the two fixing parts is fixed to the adjustment screw, and the other of the two fixing parts is provided with a through hole for the adjustment screw to pass through and supported on the end face of the adjustment nut. The adjustment nut is rotated toward one side so that the fixing part descends under the action of gravity and magnetic attraction, or the adjustment nut is rotated toward the other side so as to push the fixing part to move away from the other fixing part. The fixing part can be clamped by two axial adjustment nuts.
[0013] Preferably, a guide column made of a magnetic conductive material is fixed on the fixing part, the elastic member is sleeved on the guide column, and the fixing part is a plate-shaped structure made of a magnetic conductive material. The guide column not only guides the elastic member to ensure the balance between the two magnetic forces, but also the guide column and the fixing part are made of magnetic conductive material, which can close the magnetic circuit of the two magnets, reduce magnetic leakage, and improve the magnetic field in the air gap.
[0014] Preferably, the guide column comprises a thick section and a thin section, and one of the two fixing parts is provided with a matching hole having an inner diameter smaller than that of the thick section and used to match the thin section. The thick section and the outer section are sleeved with each other so that the inner and outer walls thereof contact each other, or the fixing part and the matching hole wall of the guide column contact the outer wall of the thin section of the guide column, so as to improve the guiding effect.
[0015] The utility model has the advantages that when the air gap is small, the resistance encountered in adjusting the air gap is smaller, and the adjustment is convenient when the air gap is small. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION
[0017] The utility model is further described below based on the accompanying drawings and specific embodiments.
[0018] Depend on Figure 1 As shown, this embodiment discloses a magnetic field generating device with adjustable air gap, including two upper and lower parallel fixed parts 1, a magnet placement space 100 for making way for magnet 2 is provided between the fixed parts 1, the magnet 2 is fixed by fasteners 11 and a pressure plate 12 on one side adjacent to the two fixed parts 1, the pressure plate 12 is positioned by the cooperation between the threaded hole on the fixed part 1 and the fastener 11, and the positioning between the fixed part 1 and the magnet 2 is achieved by the stop structure that cooperates with each other to achieve outer edge positioning. The pressure plate 12 is annular so that the end face of the magnet 2 confined between the fixed part 1 and the pressure plate 12 is partially exposed, and the pressure plate is made of hard plastic. The magnets in this embodiment are permanent magnets, and the adjacent magnetic poles of the two magnets are different.
[0019] Elastic members 3 and adjustment mechanisms for adjusting and maintaining the distance between the two fixed parts 1 are provided on the left and right opposite sides of the magnet placement space 100. Both ends of the elastic member 3 are supported between the two fixed parts 1. The elastic force direction of the elastic member 3 is parallel to or the same as the magnetization direction of the two magnets 2. Under the action of the elastic member, the two fixed parts 1 have a tendency to move away from each other.
[0020] Each adjustment mechanism includes an adjustment screw 41 and two adjustment nuts 42. The fixing portion located on the lower side is fixed to the lower end of the adjustment screw 41, and the fixing portion located on the upper side is provided with a through hole for the upper end of the adjustment screw 42 to pass through. The fixing portion located on the upper side is restricted between the two adjustment nuts 42 and contacts with the end faces of the upper and lower adjustment nuts.
[0021] A guide column 13 made of a magnetic conductive material is fixed on the two fixing parts 1, and the elastic member 3 is sleeved on the guide column 13. The fixing part 1 is a plate-shaped structure made of a magnetic conductive material. The guide column 13 includes a thick section 131 and a thin section 132. The fixing part located on the upper side of the two fixing parts is provided with a matching hole 10 with an inner diameter smaller than that of the thick section 131 and used to match the thin section. The fixing part located on the upper side is slidably fitted on the thin section 132, and the wall of the matching hole contacts the outer wall of the thin section 132. The fixing part located on the lower side is fixed to the lower end of the thick section 131.
[0022] The utility model has the advantages that when the air gap is small, the resistance encountered in adjusting the air gap is smaller, and the adjustment is convenient when the air gap is small.
Claims
1. A magnetic field generating device with adjustable air gap, Features: It comprises two parallel and spaced fixing parts, a magnet placement space for making way for the magnet is provided between the fixing parts, the two fixing parts are respectively fixed to a magnet, elastic parts and an adjustment mechanism for adjusting and maintaining the distance between the two fixing parts are provided on opposite sides of the magnet placement space, both ends of the elastic part are supported between the two fixing parts, the elastic force direction of the elastic part is parallel to or the same as the magnetization direction of the two magnets, and the two fixing parts have a tendency to move away from each other under the action of the elastic part.
2. The magnetic field generating device with adjustable air gap according to claim 1, Features: The fixing part is detachably fixed with a pressing plate by a fastener, and a space for limiting the magnet is formed between the pressing plate and the end surface of the fixing part.
3. The magnetic field generating device with adjustable air gap according to claim 2, Features: The pressing plate is annular so that the end surface portion of the magnet confined between the fixing portion and the pressing plate is exposed.
4. The magnetic field generating device with adjustable air gap according to claim 2 or 3, Features: A stop structure that cooperates with each other is formed between the pressure plate and the magnet.
5. The magnetic field generating device with adjustable air gap according to claim 1, Features: Each of the adjustment mechanisms includes an adjustment screw and at least one adjustment nut, one of the two fixing parts is fixed to the adjustment screw, and the other of the two fixing parts is provided with a through hole for the adjustment screw to pass through and is supported on the end face of the adjustment nut.
6. The magnetic field generating device with adjustable air gap according to claim 1, Features: A guide column made of a magnetic conductive material is fixed on the fixing portion, the elastic member is sleeved on the guide column, and the fixing portion is a plate-shaped structure made of a magnetic conductive material.
7. The magnetic field generating device with adjustable air gap according to claim 6, Features: The guide column comprises a thick section and a thin section, and one of the two fixing parts is provided with a matching hole whose inner diameter is smaller than that of the thick section and is used to match the thin section.