A drive mechanism

Abstract

The utility model relates to a kind of driving mechanism, including driving shaft, upper magnetic yoke, moving iron core, inner magnetic yoke, permanent magnet, magnetic shield sleeve, drive coil, lower magnetic yoke;Driving shaft axis is through the center of upper magnetic yoke and lower magnetic yoke, is equipped with magnetic shield sleeve in periphery, and magnetic shield sleeve is fastened with upper magnetic yoke and lower magnetic yoke respectively with screw up and down;Annular permanent magnet is equipped between inner magnetic yoke and magnetic shield sleeve.The utility model is opened with concentric recess from top surface to bottom in upper magnetic yoke, so that the outer edge circumferential contact of the concentric recess opening place of moving iron core and upper magnetic yoke is formed annular contact surface, the part of the upper head disc surface of moving iron core not being contacted with upper magnetic yoke forms cavity with the lower part concentric recess of upper magnetic yoke, reduces the contact area of moving iron core and upper magnetic yoke, increases magnetic resistance, so that opening and closing current is reduced and the opening and closing holding force is reduced, solve the problem that opening and closing current needs to be increased to overcome opening and closing holding force.

Description

Technical Field

[0001] This utility model relates to a drive mechanism that is widely used in electrical, mechanical and other fields, and in particular to a drive mechanism. Background Technology

[0002] Existing drive mechanisms include hydraulic, pneumatic, spring, and electromagnetic types, which have played a certain role in various industries. However, these mechanisms have complex transmissions, many parts, and generally suffer from problems such as high manufacturing costs, many failure points, and short service life. Furthermore, existing electromagnetic drive permanent magnet locking drive mechanisms have high requirements for supporting facilities due to their structure, which affects their large-scale use.

[0003] For example, Chinese utility model patent (CN201029076Y) discloses a driving mechanism including a drive shaft, an upper magnetic yoke, a moving iron core, an inner magnetic yoke, a permanent magnet, a magnetic shielding sleeve, a drive coil, and a lower magnetic yoke 8. When a clockwise current is applied, the moving iron core contacts the upper magnetic yoke.

[0004] Although the above technical solution provides a drive mechanism with electromagnetic drive and permanent magnet locking, the relatively large opening holding force means that the required closing current must be increased when the circuit breaker is closed to overcome the opening holding force. This places higher demands on the power supply and the electronic components of the control circuit, thus requiring the solution to overcome the above problems. Utility Model Content

[0005] This invention provides a driving mechanism that reduces the opening holding force and the closing current, thus solving the problem of needing to increase the closing current to overcome the opening holding force.

[0006] To achieve the above objectives, the technical solution of this utility model is further innovated based on the Chinese utility model patent (CN201029076Y).

[0007] Specifically, a driving mechanism includes a housing and a driving assembly disposed inside the housing. The housing includes an upper magnetic yoke and a lower magnetic yoke, which are respectively fastened to the upper and lower ends of a cylindrical magnetic shielding sleeve. The axis of the driving shaft passes through the interior of the cylindrical magnetic shielding sleeve and through the center of the upper magnetic yoke and the lower magnetic yoke. The driving assembly includes a moving iron core sleeved on the driving shaft, an inner magnetic yoke disposed around the moving iron core, a permanent magnet, and a driving coil. The driving coil is disposed on the lower magnetic yoke. When a clockwise current is applied to the driving coil, the moving iron core moves downward along the driving shaft to lock the driven mechanism. The characteristic feature is that when the moving iron core moves upward, a closed cavity is formed between the top of the moving iron core and the top surface of the upper magnetic yoke.

[0008] As a further improvement, the inner surface of the upper yoke extends upward to form a concentric groove, the top diameter of the moving iron core is larger than the diameter of the concentric groove, and when the top of the moving iron core contacts the outer edge of the opening of the concentric groove in a circumferential direction, the concentric groove forms a closed cavity.

[0009] As a further improvement, the concentric grooves are circular groove-shaped structures.

[0010] As a further improvement, the moving iron core includes an upper head and a lower rod integrally formed therewith. An annular groove is formed at the intersection of the cylindrical surfaces of the upper head and the lower rod. The lower edge of the annular groove is chamfered. The top surface of the inner magnetic yoke forms a first limiting platform, which abuts against the bottom surface of the upper head of the moving iron core to restrict the downward movement of the moving iron core.

[0011] As a further improvement, the lower magnetic yoke extends downward from the top near the magnetic shielding sleeve to form a fixing groove, the drive coil is disposed in the fixing groove, and the top surface of the fixing groove away from the magnetic shielding sleeve forms a second limiting platform.

[0012] As a further improvement, the permanent magnet is tightly connected to the upper part of the drive coil with the inner magnetic yoke, and the inner magnetic yoke, the permanent magnet and the drive coil are symmetrically arranged about the drive shaft.

[0013] The above-mentioned technical solution of this utility model has the following beneficial effects: By reducing the processing difficulty and without increasing the cost, this utility model extends the upper magnetic yoke from the top surface to form a concentric groove, so that the moving iron core and the outer edge of the opening of the concentric groove are in circumferential contact to form an annular contact surface, which reduces the contact area between the moving iron core and the upper magnetic yoke, increases the magnetic resistance, reduces the opening holding force, reduces the closing current, and reduces the requirements for the electronic components of the power supply and control circuit. Attached Figure Description

[0014] Figure 1 This is a cross-sectional structural diagram of a drive mechanism in the prior art;

[0015] Figure 2 for Figure 1 The top cross-sectional structural diagram along AA shows the contact area between the moving iron core and the upper yoke, where the shaded area represents the contact area between the moving iron core and the upper yoke.

[0016] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0017] Figure 4 for Figure 3 Along the top cross-sectional structure diagram of BB, the annular shaded area in the diagram represents the contact area between the moving iron core and the upper yoke.

[0018] Reference numerals in the attached drawings: 1. Drive shaft, 2. Upper yoke, 3. Moving iron core, 4. Inner yoke, 5. Permanent magnet, 6. Magnetic shielding sleeve, 7. Drive coil, 8. Lower yoke, 9. Concentric groove, 10. Cavity, 11. Annular groove, 12. First limiting platform, 13. Second limiting platform, 14. Fixing groove. Detailed Implementation

[0019] The following embodiments further illustrate the content of this utility model, but should not be construed as limiting the utility model. Any modifications or substitutions made to the methods, steps, or conditions of this utility model without departing from its spirit and essence are within the scope of this utility model.

[0020] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings and examples.

[0021] Please see Figure 3 and Figure 4 As shown, the present invention discloses a driving mechanism, including a housing and a driving assembly disposed inside the housing. The housing includes an upper magnetic yoke 2 and a lower magnetic yoke 8 respectively fastened to the upper and lower ends of a cylindrical magnetic shielding sleeve 6. The axis of the driving shaft 1 passes through the interior of the cylindrical magnetic shielding sleeve 6 and through the center of the upper magnetic yoke 2 and the lower magnetic yoke 8. The driving assembly includes a moving iron core 3 sleeved on the driving shaft 1 and an inner magnetic yoke 4, a permanent magnet 5, and a driving coil 7 disposed around the moving iron core 3. The driving coil 7 is disposed on the lower magnetic yoke 8. When a clockwise current is applied to the driving coil 7, the moving iron core 3 moves downward along the driving shaft 1 to lock the driven mechanism. The characteristic feature is that when the moving iron core 3 moves upward, a closed cavity 10 is formed between the top of the moving iron core 3 and the top surface of the upper magnetic yoke 2.

[0022] The moving iron core 3 has a "T"-shaped cross-section, is located below the upper magnetic yoke 2, and is fitted onto the drive shaft 1. The permanent magnet 5 can be a ring-shaped permanent magnet, an arc-shaped permanent magnet, or a bar-shaped permanent magnet, preferably a ring-shaped permanent magnet. When a clockwise current is applied to the drive coil 7, the moving iron core 3 generates an electromagnetic field, which, together with the magnetic field of the permanent magnet 5, forces the moving iron core 3 to move downward. At this time, the upper head of the moving iron core 3 closes with the inner magnetic yoke 4, and the lower end of its lower rod closes with the lower magnetic yoke 8, maintaining the attraction force at its maximum to lock the driven mechanism and keep it in the corresponding position. When a counterclockwise current is applied to the drive coil 7, the moving iron core 3 generates a magnetic field, which, together with the magnetic field of the permanent magnet 5, forces the moving iron core 3 to move upward. At this time, a closed cavity 10 is formed between the top of the moving iron core 3 and the top surface of the upper magnetic yoke 2.

[0023] It should be noted that the cavity 10 can be formed as follows: the upper magnetic yoke 2 extends upward from the top surface to form a concentric groove 9, the top diameter of the moving iron core 3 is larger than the diameter of the concentric groove 9, and when the top of the moving iron core 3 is in circumferential contact with the outer edge of the opening of the concentric groove 9, the concentric groove 9 forms a closed cavity 10. Furthermore, the lower end of the lower rod of the moving iron core 3 is disengaged from the lower magnetic yoke 8, so that the driven mechanism can be reset.

[0024] In some embodiments, by reducing the contact area between the top of the moving iron core 3 and the lower yoke 2, the magnetic resistance is increased. Specifically, the contact area between them is reduced from the original Φ90mm to a ring with an outer diameter of 90mm and an inner diameter of 83-87mm, preferably 85mm. That is, the inner diameter of the concentric groove 9 is 83-87mm, preferably 85mm, which reduces the opening holding force by about 63% and the closing current by about 21%.

[0025] The cavity 10 can also be formed as follows: since the moving iron core 3 has an extending groove formed from the top surface downwards, when the moving iron core 3 moves upwards, a closed cavity 10 is formed between the opening of the groove formed at its top and the top surface of the upper magnetic yoke 2.

[0026] This application forms a closed cavity 10 between the top of the moving iron core 3 and the top surface of the upper magnetic yoke 2, forming an annular contact surface. This reduces the contact area between the moving iron core 3 and the upper magnetic yoke 2, increases magnetic resistance, reduces the opening holding force, and thus reduces the required closing current, thereby reducing the requirements on the power supply and electronic components of the control circuit.

[0027] Please see Figure 3 and Figure 4 As shown, the inner surface of the upper magnetic yoke 2 extends upward to form a concentric groove 9. The top diameter of the moving iron core 3 is larger than the diameter of the concentric groove 9. When the top of the moving iron core 3 is in circumferential contact with the outer edge of the opening of the concentric groove 9, the concentric groove 9 forms a closed cavity 10.

[0028] The concentricity of the concentric groove 9 means that the groove and the central axis of the upper magnetic yoke 2 are on the same straight line. The concentric groove 9 can be square, rectangular, circular, or other shapes, preferably circular to reduce processing difficulty and avoid increasing costs. The center of the concentric groove 9 is simultaneously penetrated by the axis of the drive shaft 1. When the moving iron core 3 moves upward, its upper head contacts the outer edge of the opening of the concentric groove 9 of the upper magnetic yoke 2, and the contact surface forms an annular contact surface at the outer edge of the opening of the concentric groove 9. The part of the upper head of the moving iron core 3 that does not contact the upper magnetic yoke 2 forms a closed cavity 10 with the lower concentric groove 9 of the upper magnetic yoke 2, further realizing the formation of an annular contact surface, reducing the contact area between the moving iron core 3 and the upper magnetic yoke 2, increasing magnetic resistance, reducing the opening holding force, and thus reducing the required closing current and lowering the requirements for the power supply and electronic components of the control circuit.

[0029] Please see Figure 3 As shown, the concentric groove 9 is a circular groove structure to reduce the difficulty of processing without increasing costs.

[0030] Please see Figure 3 As shown, the moving iron core 3 includes an upper head and a lower rod integrally formed therewith. An annular groove 11 is formed at the intersection of the cylindrical surfaces of the upper head and the lower rod. The lower edge of the annular groove 11 is chamfered. The top surface of the inner magnetic yoke 4 forms a first limiting platform 12, which abuts against the bottom surface of the upper head of the moving iron core 3 to restrict the downward movement of the moving iron core 3. When the driving coil 7 is supplied with a clockwise current, the moving iron core 3 generates an electromagnetic field, which works together with the magnetic field of the permanent magnet 5 to force the moving iron core 3 to move downward. At this time, the annular groove 11 of the moving iron core 3 closes with the first limiting platform 12. The first limiting platform 12 restricts the downward movement of the moving iron core 3. Furthermore, the inner magnetic yoke 4 has an "eight"-shaped conical surface on the inner surface of the cylindrical surface of the lower rod of the moving iron core 3, which increases the gap between the inner surface of the inner magnetic yoke 4 and the outer surface of the moving iron core 3, effectively improving magnetic efficiency, reducing magnetic loss, and increasing the holding force of the locking position.

[0031] Please see Figure 2 As shown, the lower magnetic yoke 8 extends downward from the top near the magnetic shielding sleeve 6 to form a fixed groove 14. The drive coil 7 is disposed in the fixed groove 14. The top surface of the fixed groove 14 away from the magnetic shielding sleeve 6 forms a second limiting platform 13. When the drive coil 7 is supplied with a clockwise current, the moving iron core 3 generates an electromagnetic field, which works together with the magnetic field of the permanent magnet 5 to force the moving iron core 3 to move downward. At this time, the lower rod of the moving iron core 3 closes with the second limiting platform 13, and the second limiting platform 13 further restricts the downward movement of the moving iron core 3.

[0032] Please see Figure 3 As shown, the permanent magnet 5 and the inner magnetic yoke 4 are tightly connected to the upper part of the drive coil 7. The inner magnetic yoke 4, the permanent magnet 5 and the drive coil 7 are symmetrically arranged with the drive shaft 1 as the axis. The symmetrical placement of the components achieves the best electromagnetic utilization rate and better space utilization effect.

[0033] In summary, this utility model reduces processing difficulty and increases costs by extending concentric grooves 9 from the top surface upwards within the upper magnetic yoke 2. This allows the moving iron core 3 to make circumferential contact with the outer edge of the opening of the concentric groove 9, forming an annular contact surface. This reduces the contact area between the moving iron core and the upper magnetic yoke, increases magnetic resistance, reduces the opening holding force, and thus reduces the closing current, thereby lowering the requirements for the power supply and electronic components of the control circuit.

[0034] The above-described embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made by those skilled in the art to the technical solutions of the present utility model without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A driving mechanism, comprising a housing and a driving assembly disposed inside the housing, the housing comprising an upper magnetic yoke (2) and a lower magnetic yoke (8) respectively fastened to the upper and lower ends of a cylindrical magnetic shielding sleeve (6), the axis of a driving shaft (1) passing through the interior of the cylindrical magnetic shielding sleeve (6) and through the center of the upper magnetic yoke (2) and the lower magnetic yoke (8), the driving assembly comprising a moving iron core (3) sleeved on the driving shaft (1), an inner magnetic yoke (4) disposed around the moving iron core (3), a permanent magnet (5), and a driving coil (7), the driving coil (7) being disposed on the lower magnetic yoke (8), wherein when a clockwise current is applied to the driving coil (7), the moving iron core (3) moves downward along the driving shaft (1) to lock the driven mechanism, characterized in that, When the moving iron core (3) moves upward, a closed cavity (10) is formed between the top of the moving iron core (3) and the top surface of the upper magnetic yoke (2).

2. The driving mechanism according to claim 1, characterized in that: The inner surface of the upper magnetic yoke (2) extends upward to form a concentric groove (9). The top diameter of the moving iron core (3) is larger than the diameter of the concentric groove (9). When the top of the moving iron core (3) comes into circumferential contact with the outer edge of the opening of the concentric groove (9), the concentric groove (9) forms a closed cavity (10).

3. The driving mechanism according to claim 2, characterized in that: The concentric groove (9) is a circular groove structure.

4. The driving mechanism according to claim 1, characterized in that: The moving iron core (3) includes an upper head and a lower rod integrally formed therewith. An annular groove (11) is provided at the intersection of the cylindrical surfaces of the upper head and the lower rod. The lower edge of the annular groove (11) is chamfered. The top surface of the inner magnetic yoke (4) forms a first limiting platform (12) for abutting against the bottom surface of the upper head of the moving iron core (3) to restrict the downward movement of the moving iron core (3).

5. A driving mechanism according to claim 1, characterized in that: The lower magnetic yoke (8) extends downward from the top near the magnetic shielding sleeve (6) to form a fixed groove (14), the drive coil (7) is disposed in the fixed groove (14), and the top surface of the fixed groove (14) away from the magnetic shielding sleeve (6) forms a second limiting platform (13).

6. A driving mechanism according to claim 1, characterized in that: The permanent magnet (5) and the inner yoke (4) are closely connected to the upper part of the drive coil (7). The inner yoke (4), the permanent magnet (5) and the drive coil (7) are symmetrically arranged with the drive shaft (1) as the axis.

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