Electromagnetic driving device

Abstract

The electromagnetic driving device comprises an electromagnetic assembly and a push rod assembly, the electromagnetic assembly comprises a magnetic conduction assembly, the magnetic conduction assembly comprises a first magnetic conduction piece, the first magnetic conduction piece is provided with a guide hole part, and the push rod assembly can move in the direction close to the first magnetic conduction piece in the axial direction under the electromagnetic force effect of the electromagnetic assembly; the push rod assembly comprises a push rod and a magnetic-conductive push rod seat connected with the push rod, and the guide hole part is in guide fit with the push rod to guide the push rod assembly to move axially; the magnetic conductive push rod seat comprises a seat body and a protruding body, the seat body is provided with a first seat body end face close to the first magnetic conductive piece, and the protruding body protrudes towards the first magnetic conductive piece from the first seat body end face. In a power-on state, part of the protruding body is located in the guide hole part. The push rod assembly of the electromagnetic driving device has large thrust and long stroke, so that the whole device has good driving performance.

Description

Technical Field

[0001] The present application relates to the technical field of electromagnetic control, and particularly to an electromagnetic driving device. Background Art

[0002] An electromagnetic driving device includes an electromagnetic component and a push rod component. The push rod component can axially move under the electromagnetic force of the electromagnetic component, so as to exert a pushing force on an external structure.

[0003] Taking the refrigerator door body as an example of the external structure: If the electromagnetic force received by the push rod component is insufficient, the refrigerator door body cannot be pushed. Especially in the initial stage of the moving stroke of the push rod component, in this stage, to push the refrigerator door body, it is necessary to first overcome the closing force received by the refrigerator door body. Therefore, a relatively large electromagnetic force is required to push the refrigerator door body in this stage. In addition, if the moving stroke of the push rod component is insufficient, the refrigerator door body cannot be pushed to the target position.

[0004] Therefore, how to improve the driving performance of the electromagnetic driving device so that the thrust and stroke of its push rod component both meet the requirements is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] The present application provides an electromagnetic driving device, including an electromagnetic component and a push rod component. The electromagnetic component includes a magnetic conduction component, and the magnetic conduction component includes a first magnetic conduction member. The first magnetic conduction member is provided with a guiding hole portion. The push rod component can move axially in a direction approaching the first magnetic conduction member under the electromagnetic force of the electromagnetic component;

[0006] The push rod component includes a push rod and a magnetic conduction push rod seat fixedly connected to the push rod. The guiding hole portion is in guiding cooperation with the push rod to guide the axial movement of the push rod component; the magnetic conduction push rod seat includes a seat body and a protruding body. The seat body has a first seat body end face close to the first magnetic conduction member, and the protruding body protrudes from the first seat body end face towards the first magnetic conduction member; in the energized state, part of the protruding body is located in the guiding hole portion.

[0007] In the present application, since the protruding body of the magnetic conduction push rod seat protrudes from the first seat body end face of the seat body close to the first magnetic conduction member towards the first magnetic conduction member, the protruding body is closer to the first magnetic conduction member than the seat body, so that the magnetic gap between the magnetic conduction push rod seat and the first magnetic conduction member can be shortened.

[0008] In the initial stage of the moving stroke of the push rod component, the electromagnetic force received is inversely related to the magnetic gap between the magnetic conduction push rod seat and the first magnetic conduction member. Therefore, setting the protruding body can increase the electromagnetic force received by the push rod component in the initial stage of the moving stroke, so that the problem that the external structure cannot be pushed due to insufficient electromagnetic force of the push rod component in the initial stage of the moving stroke can be solved.

[0009] In this application, since some of the protruding bodies are located within the guiding hole portion when powered on, the first magnetic conductive member will not affect the moving stroke of the push rod assembly. If the protruding bodies cannot extend into the guiding hole portion of the first magnetic conductive member, the push rod assembly will contact the first magnetic conductive member after moving a short distance after the protruding bodies are provided, resulting in a limited moving stroke of the push rod assembly. Therefore, this application can solve the problem that the external structure cannot be pushed to the target position due to insufficient stroke of the push rod assembly.

[0010] The electromagnetic driving device provided in this application has good driving performance, and both the thrust and stroke of its push rod assembly can meet the usage requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a perspective view of an embodiment of the electromagnetic driving device provided in this application;

[0012] Figure 2 is Figure 1 a top view of

[0013] Figure 3 and Figure 4 is Figure 1 a view taken along the A-A direction of Figure 3 in which the push rod assembly is in the initial position, Figure 4 in which the push rod assembly is in the extreme position;

[0014] Figure 5 is a perspective view of the first magnetic conductive member;

[0015] Figure 6 is a half-sectional view of the first magnetic conductive member;

[0016] Figure 7 is a schematic diagram of the push rod and the magnetic conductive push rod seat connected to each other;

[0017] Figure 8 is Figure 7 an enlarged view of the part within the circle in

[0018] The descriptions of the reference numerals are as follows:

[0019] 101 coil assembly, 1011 coil, 1012 coil skeleton, 1013 encapsulation layer; 102 magnetic conductive assembly, 1021 first magnetic conductive member, 1021a first magnetic conductive end face, 1021b second magnetic conductive end face, 1021c insertion portion, 1021d limiting portion, 1021e mating portion, A guiding hole portion, B first through hole portion, C second through hole portion, 1022 first magnetic conductive end plate, 1023 second magnetic conductive end plate, 1024 first magnetic conductive side plate, 1025 second magnetic conductive side plate, 1026 magnetic conductive sleeve; 103 limiting member;

[0020] 201 Push rod; 202 Magnetic conduction push rod seat, 2021 Seat body, 2021a First seat body end face, 2021b Installation groove, 2022 Protruding body, 2022a Extension part, 2022b Tapered head; 203 Solder groove;

[0021] 300 Elastic reset member. Detailed implementation mode

[0022] In order to enable those skilled in the art of the present technology to better understand the technical solution of the present application, the technical solution of the present application will be further described in detail below in conjunction with the drawings and specific implementation modes.

[0023] As Figures 1-4 , the electromagnetic drive device includes an electromagnetic component, a push rod component and an elastic reset member 300.

[0024] The electromagnetic component includes a magnetic conduction component 102, and the magnetic conduction component 102 plays a role in improving the electromagnetic performance. The magnetic conduction component 102 includes at least a first magnetic conduction member 1021. As Figure 5 And Figure 6 , the first magnetic conduction member 1021 is provided with a guiding hole portion A.

[0025] In the energized state, the push rod component can move axially in the direction close to the first magnetic conduction member 1021 under the action of the electromagnetic force of the electromagnetic component, and can always move from the Figure 3 shown initial position to the Figure 4 shown limit position, and when reaching the limit position, it abuts against the first magnetic conduction member 1021, so that it can no longer move further in the direction close to the first magnetic conduction member 1021.

[0026] One end of the elastic reset member 300 abuts against the electromagnetic component, specifically against the second magnetic conduction end plate 1023 of the electromagnetic component in the figure, and the other end of the elastic reset member 300 abuts against the push rod component, specifically against the limiting member 103 of the push rod component, and the limiting member 103 is installed in the installation groove 2021b on the outer periphery of the seat body 2021 of the push rod component.

[0027] When the push rod component moves to the limit position, the elastic reset member 300 is in a compressed state, and provides a reset force for the push rod component to reset it to the initial position.

[0028] The push rod component includes a push rod 201 and a magnetic conduction push rod seat 202 connected to the push rod 201. The guiding hole portion A of the first magnetic conduction member 1021 is in guiding fit with the push rod 201, that is to say, the hole wall surface of the guiding hole portion A is in small clearance fit with the outer peripheral surface of the push rod 201, so as to be able to guide the push rod component to move along the axis of the guiding hole portion A (hereinafter referred to as the axis), so as to avoid problems such as jamming caused by the skewed movement direction of the push rod component and deformation of the push rod 201.

[0029] As Figure 7, the magnetic conduction push rod seat 202 includes a seat body 2021 and a protruding body 2022. The seat body 2021 has a first seat body end face 2021a close to the first magnetic conduction member 1021. The protruding body 2022 protrudes from the first seat body end face 2021a, and the protruding body 2022 protrudes from the first seat body end face 2021a towards the first magnetic conduction member 1021. In the energized state, the protruding body 2022 extends into the guiding hole portion A of the first magnetic conduction member 1021.

[0030] Since the protruding body 2022 of the magnetic conduction push rod seat 202 protrudes from the first seat body end face 2021a of the seat body 2021 close to the first magnetic conduction member 1021 towards the first magnetic conduction member 1021, the protruding body 2022 is closer to the first magnetic conduction member 1021 than the seat body 2021, so that the magnetic gap between the magnetic conduction push rod seat 202 and the first magnetic conduction member 1021 can be shortened. Refer to Figure 3 Understand that when the magnetic conduction push rod seat 202 is in the initial position, if the protruding body 2022 is not provided, the magnetic gap between the magnetic conduction push rod seat 202 and the first magnetic conduction member 1021 is δ2. After the protruding body 2022 is provided, the magnetic gap between the magnetic conduction push rod seat 202 and the first magnetic body is δ1, and the magnetic gap is reduced.

[0031] In the initial stage of the moving stroke of the push rod assembly, the electromagnetic force received is inversely related to the magnetic gap between the magnetic conduction push rod seat 202 and the first magnetic conduction member 1021. Therefore, setting the protruding body 2022 can increase the electromagnetic force received by the push rod assembly in the initial stage of the moving stroke, so that the problem that the external structure cannot be pushed due to insufficient electromagnetic force in the initial stage of the moving stroke of the push rod assembly can be solved.

[0032] Since part of the protruding body 2022 is located in the guiding hole portion A of the first magnetic conduction member 1021 in the energized state, the first magnetic conduction member 1021 will not affect the moving stroke of the push rod assembly. If the protruding body 2022 cannot extend into the guiding hole portion A of the first magnetic conduction member 1021, the push rod assembly will contact the first magnetic conduction member 1021 after moving a short distance after the protruding body 2022 is provided, resulting in a limited moving stroke of the push rod assembly. Therefore, the problem that the external structure cannot be pushed to the target position due to insufficient stroke of the push rod assembly can be solved when part of the protruding body 2022 is located in the guiding hole portion A of the first magnetic conduction member 1021 in the energized state.

[0033] In summary, with the above settings, it can not only improve the electromagnetic force received by the push rod assembly in the initial stage of the stroke, but also not shorten the stroke of the push rod assembly, taking both into account, so as to improve the driving performance of the electromagnetic drive device and make it better meet the application requirements.

[0034] Specifically, as Figure 7As shown, the protruding body 2022 may include a conical head portion 2022b and an extension portion 2022a. The conical head portion 2022b includes a large-diameter portion and a small-diameter portion. The large-diameter portion is closer to the seat body 201 relative to the small-diameter portion. The extension portion 2011a protrudes from the small-diameter portion of the conical head portion 2022b. One end face of the push rod 201 is butt-welded and fixed to one end face of the extension portion 2022a. In the energized state, the extension portion 2022a passes through the guiding hole portion A. Butt-welding and fixing have high connection reliability, and compared with interference press-fitting fixation, there is no need to provide a press-fitting hole on the protruding body 2022. Therefore, it can ensure that the protruding body 2022 has a relatively large radial cross-sectional area. In the initial stage of the stroke of the push rod assembly, the electromagnetic force received by the push rod assembly is positively correlated with the radial cross-sectional area of the protruding body 2022. Therefore, the larger the radial cross-sectional area of the protruding body 2022, the more beneficial it is to increase the electromagnetic force received by the push rod assembly in the initial stage of the stroke.

[0035] Specifically, as Figure 8 shown, a solder groove 203 may be provided on the outer periphery of the butting position of the push rod 201 and the extension portion 2022a. Solder is filled in the solder groove 203. After welding, the outer surface of the solder can be made to be basically not protruded from the outer peripheral surface of the extension portion 2022a and the outer peripheral surface of the push rod 201 by grinding, so as to avoid the solder affecting the movement of the push rod assembly.

[0036] Specifically, the aperture of the guiding hole portion A of the first magnetic conductive member 1021 may be set to be substantially the same as the outer diameter of the protruding body 2022. In this way, after the protruding body 2022 extends into the first magnetic conductive member 1021, the outer peripheral surface of the protruding body 2022 can contact the hole wall surface of the guiding hole portion A, but it does not affect the axial movement of the protruding body 2022. In this way, on the premise of not affecting the axial movement of the protruding body 2022, the radial cross-sectional area of the protruding body 2022 can be maximized. In the initial stage of the stroke of the push rod assembly, the electromagnetic force received by the push rod assembly is positively correlated with the radial cross-sectional area of the protruding body 2022. Therefore, the larger the radial cross-sectional area of the protruding body 2022, the more beneficial it is to increase the electromagnetic force received by the push rod assembly in the initial stage of the stroke.

[0037] Specifically, as Figure 6 , the first magnetic conductive member 1021 has a first magnetic conductive end face 1021a away from the first seat body end face 2021a. The first magnetic conductive member 1021 may be provided with a first through hole portion B. One end of the first through hole portion B penetrates to the first magnetic conductive end face 1021a, and the other end of the first through hole portion B communicates with the guiding hole portion A. As Figure 4 shown, in the energized state, the portion (extension portion 2022a) of the protruding body 2022 away from the seat body 2021 extends into the first through hole portion B, and the outer peripheral surface of the protruding body 2022 does not contact the hole wall surface of the first through hole portion B.

[0038] At the end stage of the stroke of the push rod assembly, the protruding body 2022 has extended into the guiding hole portion A and is in contact with the hole wall of the guiding hole portion A. At this time, a closed-loop magnetic circuit is formed. Under the action of the closed-loop magnetic circuit, the larger the contact area between the protruding body 2022 and the hole wall of the guiding hole portion A, the greater the resistance for the push rod assembly to move towards the first magnetic conductive member 1021. By providing the first through-hole portion B and ensuring that the outer peripheral surface of the protruding body 2022 does not contact the hole wall surface of the first through-hole portion B, the contact area between the protruding body 2022 and the guiding hole portion A can be reduced, thereby reducing the moving resistance of the push rod assembly at the end stage of the stroke and improving the driving performance of the electromagnetic driving device.

[0039] In the illustrated embodiment, the first through-hole portion B is a tapered hole portion. The large-diameter end of the first through-hole portion B penetrates through to the first magnetic conductive end surface 1021a, the small-diameter end of the first through-hole portion B communicates with the guiding hole portion A, and the aperture of the small-diameter end of the first through-hole portion B is not less than the aperture of the guiding hole portion A. By adopting the tapered hole portion for the first through-hole portion B, it can not only reduce the moving resistance of the push rod assembly at the end stage of the stroke but also take into account the electromagnetic performance of the electromagnetic assembly. Of course, in actual implementation, the first through-hole portion B is not limited to the tapered hole portion, as long as it is ensured that the protruding body 2022 does not contact the hole wall surface of the first through-hole portion B when it extends into the first through-hole portion B.

[0040] Specifically, as Figure 6 , the second magnetic conductive member further has a second magnetic conductive end surface 1021b close to the first seat body end surface 2021a. The second magnetic conductive member can also be provided with a second through-hole portion C, and the second through-hole portion C is a tapered hole portion. The large-diameter end of the second through-hole portion C penetrates through to the second magnetic conductive end surface 1021b, and the small-diameter end of the second through-hole portion C communicates with the guiding hole portion A. As Figure 4 shown, in the energized state, the second through-hole portion C cooperates with the tapered head portion 2022b. With such a setting, the magnetic gap between the push rod assembly and the first magnetic conductive member 1021 can be reduced, thereby further increasing the electromagnetic force received by the push rod assembly during the initial stroke stage.

[0041] Specifically, as Figure 3 and Figure 4 , the electromagnetic assembly further includes a coil assembly. The coil assembly includes a coil 1011, a coil skeleton, and an encapsulation layer 1013. The coil skeleton is used to support the coil 1011, and the coil 1011 is wound around the outer periphery of the coil skeleton. The encapsulation layer 1013 is used to coat the coil 1011 and / or the coil skeleton, serving to protect the coil 1011 and / or the coil skeleton from external erosion and improve the operating reliability of the coil assembly.

[0042] The magnetic conductive assembly 102 of the electromagnetic assembly further includes a first magnetic conductive end plate 1022, a second magnetic conductive end plate 1023, a magnetic conductive sleeve 1026, and at least one magnetic conductive side plate.

[0043] The coil assembly is sleeved on the outer periphery of the magnetic conduction sleeve 1026, and the push rod assembly is inserted into the magnetic conduction sleeve 1026. The seat body 2021 of the push rod assembly is in guiding cooperation with the magnetic conduction sleeve 1026 to guide the axial movement of the push rod assembly.

[0044] The first magnetic conduction end plate 1022 and the first magnetic conduction member 1021 are arranged at one end of the coil assembly. The first magnetic conduction end plate 1022 is provided with a mounting hole portion. As Figure 6 , the first magnetic conduction member 1021 is sequentially provided with a matching portion 1021e, a limiting portion 1021d, and an insertion portion 1021c along the axial direction. The mounting hole portion of the first magnetic conduction end plate 1022 is sleeved on the outer periphery of the matching portion 1021e of the first magnetic conduction member 1021. The limiting portion 1021d of the first magnetic conduction member 1021 is arranged between the first magnetic conduction end plate 1022 and the coil assembly and axially abuts against the first magnetic conduction end plate 1022 and the coil assembly to fix the axial relative positions of the first magnetic conduction end plate 1022, the first magnetic conduction member 1021, and the magnetic conduction sleeve 1026. The insertion portion 1021c of the first magnetic conduction member 1021 is inserted into one end of the magnetic conduction sleeve 1026.

[0045] The second magnetic conduction end plate 1023 is arranged at the other end of the coil assembly. In the illustrated embodiment, two second magnetic conduction end plates 1023 are provided, and the two second magnetic conduction end plates 1023 are stacked in sequence along the axial direction.

[0046] The first magnetic conduction side plate 1024 and the second magnetic conduction side plate 1025 are provided in the figure. The first magnetic conduction side plate 1024 and the second magnetic conduction side plate 1025 are respectively arranged on both sides of the coil assembly, and both ends are respectively connected to the magnetic conduction end plates at the corresponding ends. In the illustrated embodiment, the first magnetic conduction side plate 1024, the second magnetic conduction side plate 1025, and the first magnetic conduction end plate 1022 form a U-shaped integral magnetic conductor. Of course, in actual implementation, the structure of the magnetic conductor is not limited to the U shape, and for example, it can also be a square shape, a C shape, a cylindrical shape, etc.

[0047] The above uses specific examples to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. Electromagnetic drive device, comprising an electromagnetic component and a push rod component, characterized in that The electromagnetic component includes a magnetic conduction component, the magnetic conduction component includes a first magnetic conduction member, the first magnetic conduction member is provided with a guiding hole portion, and the push rod assembly can move axially in the direction close to the first magnetic conduction member under the electromagnetic force of the electromagnetic component; The push rod assembly includes a push rod and a magnetic conduction push rod seat fixedly connected to the push rod. The guiding hole portion is in guiding cooperation with the push rod to guide the axial movement of the push rod assembly; the magnetic conduction push rod seat includes a seat body and a protruding body. The seat body has a first seat body end face close to the first magnetic conduction member, and the protruding body protrudes from the first seat body end face towards the first magnetic conduction member; in the energized state, part of the protruding body is located in the guiding hole portion.

2. The electromagnetic drive device according to claim 1, characterized in that The protruding body includes a conical head portion and an extending portion. The conical head portion includes a large diameter portion and a small diameter portion. The large diameter portion is closer to the seat body than the small diameter portion. The extending portion protrudes from the small diameter portion. One end face of the push rod is butt-welded and fixed to one end face of the extending portion. In the energized state, the extending portion passes through the guiding hole portion.

3. The electromagnetic driving device according to claim 2, wherein The first magnetic conduction member has a second through hole portion, the second through hole portion is a conical hole portion, the first magnetic conduction member has a second magnetic conduction end face close to the first seat body end face, the large diameter end of the second through hole portion penetrates to the second magnetic conduction end face, and the small diameter end of the second through hole portion is communicated with the guiding hole portion; a conical portion is provided at one end of the seat body close to the second magnetic conduction end face; in the energized state, the conical portion is matched with the conical hole portion.

4. The electromagnetic drive device according to claim 1, characterized in that, When the protruding body extends into the guiding hole portion, the outer peripheral surface of the protruding body contacts the hole wall surface of the guiding hole portion.

5. The electromagnetic driving device according to claim 4, characterized in that, The first magnetic conduction member has a first through hole portion, the first magnetic conduction member has a first magnetic conduction end face away from the first seat body end face, one end of the first through hole portion penetrates to the first magnetic conduction end face, and the other end of the first through hole portion is communicated with the guiding hole portion; when the push rod assembly moves to the limit position where it abuts against the first magnetic conduction member, the end of the protruding body away from the seat body extends into the first through hole portion, and the outer peripheral surface of the protruding body does not contact the hole wall surface of the first through hole portion.

6. The electromagnetic drive device according to claim 5, wherein The first through hole portion is a conical hole portion, the large diameter end of the first through hole portion penetrates to the first magnetic conduction end face, and the small diameter end of the first through hole portion is communicated with the guiding hole portion.

7. The electromagnetic driving device according to any one of claims 1-6, characterized in that, It further includes an elastic reset member. One end of the elastic reset member abuts against the electromagnetic component, and the other end abuts against the push rod assembly. When the push rod assembly moves to the limit position where it abuts against the first magnetic conduction member, the elastic reset member is in a compressed state to provide a reset force for the push rod assembly to reset it to the initial position.

8. The electromagnetic drive device according to claim 7, characterized in that The electromagnetic component further includes a coil component, and the coil component includes a coil, a coil skeleton and an encapsulation layer.

9. The electromagnetic driving device according to claim 8, wherein The magnetic conduction component further includes a magnetic conduction sleeve, a first magnetic conduction end plate, a second magnetic conduction end plate and a magnetic conduction side plate. The coil skeleton is sleeved on the outer periphery of the magnetic conduction sleeve. The first magnetic conduction end plate and the first magnetic conduction member are arranged at one end of the coil component, the second magnetic conduction end plate is arranged at the other end of the coil component, and the magnetic conduction side plate is arranged on the side of the coil component.

10. The electromagnetic driving device according to claim 9, characterized in that, The first magnetic conductive part is successively provided with a matching part, a limiting part and an insertion part along the axial direction. The first magnetic conductive end plate is provided with a mounting hole part, and the mounting hole part is sleeved on the outer periphery of the matching part. The insertion part is inserted into one end of the magnetic conductive sleeve, and the limiting part is located between the first magnetic conductive end plate and the coil assembly and axially abuts against the first magnetic conductive end plate and the coil assembly.

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