Push-pull electromagnet

Abstract

The push-pull type electromagnet comprises a shell, at least two sets of coils, a movable part, a movable push rod and at least one sealing part, an inner cavity is formed in the shell, the shell is provided with a penetrating-out channel and a push rod channel, the two sets of coils are coaxially arranged in the inner cavity, and the movable push rod is arranged in the inner cavity. An axial passage filled with lubricating oil is formed along the axial center, the penetrating-out passage and the push rod passage are respectively coaxial with the axial passage and are communicated with two axial end parts of the axial passage, the movable part is movably arranged in the axial passage and the penetrating-out passage, the movable push rod movably and coaxially penetrates through the push rod passage, and the movable push rod is movably arranged in the axial passage and the penetrating-out passage. An oil groove filled with lubricating oil and a sealing ring groove are formed in the push rod channel in the circumferential direction, oil passing spaces which are communicated with each other are formed in the portion, between the oil groove and the sealing ring groove, of the movable push rod, and the sealing piece is arranged on the movable push rod in a sleeved mode in the mode that the sealing piece is attached to the inner wall of the push rod channel. And the sealing ring is positioned in the sealing ring groove.

Description

Technical Field

[0001] This application relates to the field of electromagnet technology, and more particularly to push-pull electromagnets. Background Technology

[0002] A push-pull electromagnet is a device in which two sets of coils are coaxially mounted inside the electromagnet housing, with the moving iron core positioned at the axial center of the two sets of coils. When both sets of coils are energized, the moving iron core reciprocates axially based on the principle of electromagnetic induction. As the moving iron core reciprocates axially, it drives a push rod connected to it, causing it to reciprocate axially to achieve the pushing and pulling action. Solenoid valves equipped with push-pull electromagnets are mainly used in forklift gearboxes and in compact spaces within vehicles. Lubricating oil is provided in the channel through which the moving iron core reciprocates to improve the smoothness of its axial movement.

[0003] In existing push-pull electromagnets, the electromagnet housing has a channel coaxial with the moving iron core's movement channel to accommodate the emergency push rod. To prevent lubricating oil in the channel where the moving iron core reciprocates from leaking out of the channel containing the emergency push rod, a sealing ring is fitted onto the emergency push rod. However, when the emergency push rod remains in the same position for an extended period, the static friction between the sealing ring and the inner wall of the channel increases, causing the emergency push rod to become stuck within the channel. Consequently, the emergency push rod cannot be pushed by external force to slide within the channel.

[0004] On the one hand, when the moving iron core of a push-pull electromagnet becomes stuck due to prolonged disuse, the problem can be solved by pushing the emergency push rod into the moving iron core's movement channel to move the electromagnet. However, if the emergency push rod is stuck in the channel, it cannot be pushed smoothly, thus preventing the problem from being solved. On the other hand, if the emergency push rod slides within the channel and is partially within the moving iron core's movement channel, and both sets of coils have been de-energized for a long time, when one of the coils near the emergency push rod is suddenly energized, the magnetic force generated by the energized coil will attract the moving iron core to move axially and push the emergency push rod. However, if the emergency push rod is stuck in the channel, it cannot be pushed by the moving iron core, resulting in the moving iron core moving poorly after being energized. Utility Model Content

[0005] To solve the aforementioned technical problems and achieve at least one advantage of this application, this application provides a push-pull electromagnet, wherein the push-pull electromagnet comprises:

[0006] A housing, the housing forming an inner cavity, the housing having an outlet channel and a push rod channel, the outlet channel and the push rod channel being coaxial and both communicating with the inner cavity;

[0007] At least two sets of coils are coaxially arranged in the inner cavity, and an axial channel containing lubricating oil is formed at the axial center of the two sets of coils. The through-channel and the push rod channel are respectively formed at the two ends of the axial channel. The axial channel, the through-channel and the push rod channel are coaxial and interconnected.

[0008] The movable component includes a moving core and a pushing part. The moving core is movably mounted in the axial channel in a manner that allows it to move axially along the axial channel, and the moving core is coaxial with the axial channel. The pushing part is disposed at the end of the moving core near the through-channel in the axial direction, so as to be able to pass through the through-channel and slide within the through-channel.

[0009] A movable push rod is coaxially disposed in the push rod channel, allowing it to slide axially along the channel. The movable push rod partially extends through the channel. At least one oil groove and at least one sealing ring groove are formed circumferentially on the movable push rod, both located within the push rod channel. The oil groove is filled with lubricating oil. An oil passage space is also provided on the movable push rod, located between the oil groove and the sealing ring groove in the extending direction of the movable push rod. The oil groove communicates with the sealing ring groove through the oil passage space.

[0010] At least one seal is fitted onto the movable push rod in such a way that it remains in contact with the inner wall of the push rod channel, and the seal is located in the sealing ring groove.

[0011] According to one embodiment of this application, the oil groove and the oil passage space are both implemented as two. In the extension direction of the movable push rod, the two oil grooves and the two oil passage spaces are respectively opened on both sides of the sealing ring groove, and the two oil grooves are respectively connected to the oil groove through one of the oil passage spaces.

[0012] According to one embodiment of this application, the oil groove has a V-shape on the overall axial cross-section of the movable push rod.

[0013] According to one embodiment of this application, the push-pull electromagnet further includes a guide sleeve, which is held within the axial channel in such a way that it extends axially along the axial channel, and the guide sleeve is fitted around the outer periphery of the moving core.

[0014] According to one embodiment of this application, the moving core is provided with at least one oil passage hole in a direction parallel to the axial direction, and both ends of the oil passage hole in the extending direction are connected to the axial channel.

[0015] According to one embodiment of this application, the housing has a front portion and a rear portion. The front portion is located at the end of the housing away from the movable push rod. The through-hole is formed in the front portion in a manner coaxial with and communicating with the axial channel. The rear portion is located at the end of the housing near the movable push rod. The push rod channel is formed in the rear portion in a manner coaxial with and communicating with the axial channel. The front portion extends partially toward the axial channel at the location where the through-hole is formed to maintain contact with the inner wall of the catheter sleeve, forming a first inward buckle. The rear portion extends partially toward the axial channel at the location where the push rod channel is formed to maintain contact with the inner wall of the catheter sleeve, forming a second inward buckle.

[0016] According to one embodiment of this application, the push-pull electromagnet further includes a magnetic shielding component, which is disposed at the end of the first inner buckle near the moving core portion, and the magnetic shielding component is located between the first inner buckle and the moving core portion, and the magnetic shielding component is made of a non-magnetic material.

[0017] According to one embodiment of this application, the second inner buckle has a circumferentially formed receiving space on the inner wall of the end near the moving core, and the second inner buckle has an anti-disengagement step. The receiving space forms the anti-disengagement step at the bottom wall along the axial direction of the push rod channel. The movable push rod extends radially at the end near the moving core to form an anti-disengagement flange. In the axial direction of the receiving space, the anti-disengagement flange is opposite to the anti-disengagement step.

[0018] According to one embodiment of this application, the movable push rod has at least one missing groove at one end near the moving core.

[0019] According to one embodiment of this application, at least two oil passage holes are provided, and the at least two oil passage holes are provided in the moving core in a manner that is evenly arranged around the axis of the moving core. Attached Figure Description

[0020] Figure 1 A perspective view of a preferred embodiment of this application is shown.

[0021] Figure 2 It shows Figure 1 A cross-sectional view of a preferred embodiment of this application.

[0022] Figure 3 It shows Figure 2 A magnified view of point A in the middle.

[0023] Figure 4 It shows Figure 2 A magnified view of point B in the middle.

[0024] Figure 5A perspective view of the movable component described in a preferred embodiment of this application is shown.

[0025] Figure 6 A perspective view of the movable push rod and the seal element according to a preferred embodiment of this application is shown. Detailed Implementation

[0026] The following description is intended to disclose this application and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of this application defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of this application.

[0027] Those skilled in the art should understand that, in the disclosure of this application, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this application.

[0028] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0029] refer to Figures 1 to 6 A preferred embodiment of the push-pull electromagnet according to this application will be described in detail below, wherein the push-pull electromagnet includes a housing 10, at least two sets of coils 20, a movable member 30, a movable push rod 40, and at least one seal 50.

[0030] Specifically, the housing 10 forms an inner cavity. The housing 10 has a through-hole channel 1101 and a push-rod channel 1201. The through-hole channel 1101 and the push-rod channel 1201 are coaxial and both communicate with the inner cavity. Two sets of coils 20 are coaxially arranged in the inner cavity, and an axial channel 201 containing lubricating oil is formed at the axial center of the two sets of coils 20. The through-hole channel 1101 and the push-rod channel 1201 are respectively formed at the two ends of the axial channel 201 along its axial direction. The axial channel 201, the through-hole channel 1101, and the push-rod channel 1201 are coaxial and interconnected.

[0031] The movable component 30 includes a movable core 31 and a pushing part 32. The movable core 31 is movably mounted in the axial channel 201 so as to be axially movable along the axial channel 201, and the movable core 31 is coaxial with the axial channel 201. When the two sets of coils 20 are energized respectively, the movable core 31 is attracted by the magnetic field force generated by the energization of the two sets of coils 20 respectively, so as to reciprocate axially within the axial channel 201. The pushing part 32 is disposed at the end of the movable core 31 near the exit channel 1101 in the axial direction, so as to be able to pass through the exit channel 1101 and slide within the exit channel 1101.

[0032] The movable push rod 40 is coaxially disposed in the push rod channel 1201 in a manner that allows it to slide axially along the push rod channel 1201, and the movable push rod 40 partially penetrates the push rod channel 1201. The movable push rod 40 has at least one oil groove 401 and at least one sealing ring groove 402 circumferentially formed, both of which are located within the push rod channel 1201. The oil groove 401 is filled with lubricating oil. The sealing member 50 is fitted onto the movable push rod 40 in a manner that maintains contact with the inner wall of the push rod channel 1201, and the sealing member 50 is located within the sealing ring groove 402. The movable push rod 40 also has an oil passage space 403. In the extension direction of the movable push rod 40, the oil passage space 403 is located between the oil groove 401 and the sealing ring groove 402, and the oil groove 401 is connected to the sealing ring groove 402 through the oil passage space 403, so that the lubricating oil in the oil groove 401 can flow into the sealing ring groove 402 through the oil passage space 403.

[0033] It should be noted that when a set of coils 20 near the movable push rod 40 is energized and generates a magnetic field, the moving core 31 moves axially toward the movable push rod 40, and the end of the movable push rod 40 near the axial channel 201 extends into the axial channel 201, the moving core 31 will abut against the portion of the movable push rod 40 located inside the axial channel 201. This will push the movable push rod 40 so that the sealing member 50 is kept against the inner wall of the push rod channel 1201, causing the movable push rod 40 to move as a whole toward exiting the push rod channel 1201.

[0034] As an example, since the lubricating oil in the oil groove 401 can flow naturally into the sealing ring groove 402, part of the lubricating oil in the oil groove 401 flows to the space between the seal 50 and the inner wall of the push rod channel 1201, thereby reducing the friction between the seal 50 and the inner wall of the push rod channel 1201.

[0035] Therefore, since the lubricating oil in the oil groove 401 can partially flow to the space between the seal 50 and the inner wall of the push rod channel 1201, it prevents the static friction between the seal 50 and the inner wall of the push rod channel 1201 from increasing due to the long period of disuse of the push-pull electromagnet. When the moving core 31 is attracted by the magnetic field force generated by the energized coil 20 near the movable push rod 40 and comes into contact with the part of the movable push rod 40 located in the axial channel 201, the moving core 31 can smoothly move the movable push rod 40 in the direction of passing through the push rod channel 1201 by pushing the movable push rod 40 so that the seal 50 is kept in contact with the inner wall of the push rod channel 1201. This solves the problem of the moving core 31 not moving smoothly due to the long period of disuse of the push-pull electromagnet.

[0036] Meanwhile, when the moving core 31 becomes stuck in the axial channel 201 due to the push-pull electromagnet not being used for a long time, the lubricating oil in the oil groove 401 can partially flow to the space between the seal 50 and the inner wall of the push rod channel 1201 to prevent the static friction between the seal 50 and the inner wall of the push rod channel 1201 from increasing. This allows the moving core 31 to be pushed smoothly into the axial channel 201 by the movable push rod 40, thus solving the problem of the moving core 31 being stuck in the axial channel 201.

[0037] Understandably, since the axial channel 201 is filled with lubricating oil, the smoothness of the moving core 31 when moving axially along the axial channel 201 can be improved. At the same time, since the seal 50 remains in contact with the inner wall of the push rod channel 1201, the lubricating oil in the axial channel 201 can be prevented from leaking out from the gap between the seal 50 and the push rod channel 1201.

[0038] It should be noted that, in order to improve the sealing performance of the seal 50 when it is attached to the push rod channel 1201, the seal 50 is compressed between the bottom wall of the sealing ring groove 402 and the inner wall of the push rod channel 1201 in a manner that maintains a partial compression.

[0039] It is worth mentioning that, since the lubricating oil in the oil groove 401 can partially flow to the space between the seal 50 and the inner wall of the push rod channel 1201 to fill the gap between them, the seal 50 does not need to be in close contact with the inner wall of the push rod channel 1201 with a large amount of compression. This reduces the amount of compression of the seal 50 while ensuring that no gap forms between the seal 50 and the inner wall of the push rod channel 1201. Simultaneously, it prevents a large amount of lubricating oil in the axial channel 201 from leaking out through the gap between the seal 50 and the push rod channel 1201 due to the movement of the moving core 31 within the axial channel 201. Furthermore, because the amount of compression of the seal 50 is reduced, it prevents an increase in static friction between the seal 50 and the inner wall of the push rod channel 1201 when the push-pull electromagnet is not used for a long time.

[0040] Preferably, there are two oil grooves 401 and two oil passages 403. In the extension direction of the movable push rod 40, the two oil grooves 401 and the two oil passages 403 are respectively opened on both sides of the sealing ring groove 402, and the two oil grooves 401 are respectively connected to the oil groove 401 through one of the oil passages 403.

[0041] It is worth mentioning that, since an oil groove 401 is provided on both sides of the sealing ring groove 402 in the extension direction of the movable push rod 40, the lubricating oil in the two oil grooves 401 can be immersed from both sides in the axial direction of the seal 50 into the gap between the seal 50 and the inner wall of the push rod channel 1201. Compared with immersion from one side into the gap between the seal 50 and the inner wall of the push rod channel 1201, the immersion from both sides makes it easier for the lubricating oil to fill the gap between the seal 50 and the inner wall of the push rod channel 1201.

[0042] Preferably, the seal 50 is implemented to include a sealing ring.

[0043] Preferably, the two oil grooves 401 are respectively close to the sealing ring groove 402 in the axial direction of the movable push rod 40, so as to reduce the amount of lubricating oil that needs to be injected into the oil groove 401 and flows into the oil groove 401 through the oil passage space 403, thereby reducing manufacturing costs.

[0044] Specifically, the oil groove 401 has a V-shape in the overall axial cross-section of the movable push rod 40. Because the inner wall of the oil groove 401 is inclined, the smoothness of the lubricating oil in the oil groove 401 sliding along the inner wall of the oil groove 401 through the oil passage 403 into the sealing ring groove 402 is improved. At the same time, because the oil groove 401 in the overall axial cross-section of the movable push rod 40 has a V-shape, the amount of lubricating oil that needs to be injected into the oil groove 401 is reduced.

[0045] Preferably, the moving core 31 and the pushing part 32 are made of iron as a single piece to improve the integrity of the moving core 31 and the pushing part 32, thereby preventing the connection between the moving core 31 and the pushing part 32 from loosening due to the moving core 31 driving the pushing part 32 to move repeatedly, and improving the stability when the moving core 31 drives the pushing part 32 to move.

[0046] Preferably, the push-pull electromagnet further includes a conduit sleeve 60. The conduit sleeve 60 is held within the axial channel 201, extending axially along the axial direction of the channel, and is fitted around the outer periphery of the moving core 31. This improves the stability of the moving core 31 when it moves axially due to the magnetic field force generated by one set of coils 20 being energized, and prevents friction between the moving core 31 and the coils 20 during axial movement. Simultaneously, the conduit sleeve 60 prevents lubricating oil leakage from the axial channel 201 from contaminating the coils 20.

[0047] Specifically, the conduit sleeve 60 is made of a non-magnetic material, such as stainless steel, to prevent the conduit sleeve 60 and the moving core 31 from being partially magnetized by the coil 20 due to prolonged exposure to the axial channel 201, thus preventing the moving core 31 from being attracted and stuck together by magnetic force, which would reduce the smoothness of the moving core 31 when it moves axially.

[0048] Preferably, the moving core 31 is provided with at least one oil passage hole 3101 in a direction parallel to the axial direction, and both ends of the oil passage hole 3101 in the extending direction are connected to the axial channel 201.

[0049] As an example, when the moving core 31 moves axially toward the movable push rod 40, the lubricating oil in the end space of the axial channel 201 near the movable push rod 40 will be squeezed by the moving core 31 and flow into the oil passage 3101, and enter the end space of the axial channel 201 away from the movable push rod 40 through the oil passage 3101, so as to prevent the moving core 31 from being unable to move smoothly axially due to the obstruction of the lubricating oil in the axial channel 201.

[0050] It should be noted that, due to the gap between the moving core 31 and the inner wall of the conduit sleeve 60 for lubricating oil flow, when the moving core 31 moves axially towards the movable push rod 40, the lubricating oil in the end space of the axial channel 201 near the movable push rod 40 can flow into the end space of the axial channel 201 away from the movable push rod 40 through the oil passage 3101, and also through the gap between the moving core 31 and the inner wall of the conduit sleeve 60. In other words, the opening of the oil passage 3101 can increase the flow rate of lubricating oil in the end space of the axial channel 201 near the movable push rod 40 to the end space of the axial channel 201 away from the movable push rod 40, thus ensuring that the moving core 31 moves smoothly axially.

[0051] Preferably, at least two oil passage holes 3101 are provided, and the at least two oil passage holes 3101 are provided on the moving core 31 in a manner that is evenly arranged around the axis of the moving core 31, so that the center of gravity of the moving core 31 is more uniform, thereby improving the stability of the moving core 31 when it moves along the axial direction.

[0052] Preferably, the housing 10 has a front portion 11 and a rear portion 12. The front portion 11 is located at the end of the housing 10 away from the movable push rod 40, and the through-hole channel 1101 is formed in the front portion 11 in a manner coaxial with and communicating with the axial channel 201. The rear portion 12 is located at the end of the housing 10 near the movable push rod 40, and the push rod channel 1201 is formed in the rear portion 12 in a manner coaxial with and communicating with the axial channel 201. The front portion 11 extends partially into the axial channel 201 at the location where the through-hole channel 1101 is formed, in a manner that keeps it in contact with the inner wall of the catheter sleeve 60, to form a first inward buckle 111, thereby extending the axial length of the through-hole channel 1101. The rear portion 12 extends partially toward the axial channel 201 at the location where the push rod channel 1201 is opened to remain in contact with the inner wall of the catheter sleeve 60, thereby forming a second inward buckle 121 and extending the axial length of the push rod channel 1201.

[0053] In other words, since the first inner buckle 111 and the second inner buckle 121 are respectively located at the two ends of the catheter sleeve 60 in a manner that keeps them in contact with the inner wall of the catheter sleeve 60, the stability of the catheter sleeve 60 when it is fitted on the outer periphery of the moving core 31 is improved by the first inner buckle 111 and the second inner buckle 121, so as to prevent the moving core 31 from driving the catheter sleeve 60 to move when it moves axially.

[0054] Understandably, when the set of coils 20 furthest from the movable push rod 40 is not energized, and the moving core 31 is attracted along the axis by the magnetic force generated by the energized set of coils 20 near the movable push rod 40, the moving core 31 will limit its movement distance by striking the end of the movable push rod 40 near itself. Correspondingly, when the set of coils 20 near the movable push rod 40 is not energized, and the moving core 31 is attracted along the axis by the magnetic force generated by the energized set of coils 20 furthest from the movable push rod 40, the moving core 31 will limit its movement distance by striking the end of the first inner buckle 111 near itself.

[0055] Because the axial movement distance of the moving core 31 is limited, after the moving core 31 moves axially due to the magnetic field force generated by the energization of one set of coils 20, it can be attracted again by the magnetic field force generated by the energization of another set of coils 20 and move axially again. In other words, the axial movement distance of the moving core 31 is limited to prevent it from leaving the attraction range of the magnetic field force generated by the energization of the set of coils 20 that is away from the moving core 31.

[0056] Preferably, the movable push rod 40 is made of a non-magnetic material, such as stainless steel, to prevent the movable core 31 from becoming partially magnetized due to the influence of the coil 20 after being in the axial channel 201 for a long time. This would prevent the movable push rod 40 from being attracted and stuck together by the magnetic force after contact with the movable core 31, thus reducing the smoothness of the movable core 31 when it moves axially.

[0057] Preferably, the push-pull electromagnet further includes a magnetic shielding member 70, which is disposed at the end of the first inner buckle 111 near the moving core 31, and the magnetic shielding member 70 is located between the first inner buckle 111 and the moving core 31, so as to block the first inner buckle 111 and the moving core 31 through the magnetic shielding member 70.

[0058] Specifically, the magnetic shielding element 70 is made of a non-magnetic material, such as stainless steel.

[0059] It is understandable that when the set of coils 20 near the movable push rod 40 is not energized, and the moving core 31 is attracted by the magnetic force generated by the energized set of coils 20 away from the movable push rod 40 and moves along the axis, the moving core 31 will collide with the end of the first inner buckle 111 near the moving core 31 through the magnetic shield 70. Since the magnetic shield 70 is located between the first inner buckle 111 and the moving core 31, it prevents the first inner buckle 111 from being attracted and stuck together by the magnetic force after contact with the moving core 31 due to the influence of the coils 20 after being in the axial channel 201 for a long time, thus reducing the smoothness of the moving core 31 when moving along the axis.

[0060] Preferably, the magnetic shielding member 70 is implemented in a ring shape, and the magnetic shielding member 70 is fixed to the end of the first inner buckle 111 near the moving core 31.

[0061] Preferably, the second inner buckle 121 has a circumferentially formed receiving space 12101 on the inner wall of its end near the moving core 31, and the second inner buckle 121 has an anti-disengagement step 1211, the receiving space 12101 forming the anti-disengagement step 1211 on the bottom wall along the axial direction of the push rod channel 1201. The movable push rod 40 extends radially at its end near the moving core 31 to form an anti-disengagement flange 41. In the axial direction of the receiving space 12101, the anti-disengagement flange 41 is opposite to the anti-disengagement step 1211.

[0062] As an example, the moving core 31 is attracted by the magnetic force generated by the energized coils 20 near the movable push rod 40 and moves along the axis. When the moving core 31 strikes the end of the movable push rod 40 near the moving core 31, and the moving core 31 pushes the movable push rod 40 to move axially within the push rod channel 1201, the anti-detachment flange 41 of the movable push rod 40 will abut against the anti-detachment step 1211, thereby preventing the movable push rod 40 from moving out of the push rod channel 1201.

[0063] In this embodiment, the movable push rod 40 has at least one notch 404 at one end near the moving core 31 to reduce the contact area between the moving core 31 and the movable push rod 40 when the moving core 31 is attracted by the magnetic field force generated by the energized coils 20 near the movable push rod 40 and moves along the axis, and the moving core 31 impacts the end of the movable push rod 40 near the moving core 31. In another modified embodiment, the notch 404 is located at one end of the moving core 31 near the movable push rod 40.

[0064] To enable those skilled in the art to understand this application, in at least one embodiment of this application, only the example of the missing groove 404 being opened at one end of the movable push rod 40 near the moving core 31 is described.

[0065] It is understood that, since the movable push rod 40 has at least one notch 404 at one end near the movable core 31, when the movable core 31 impacts the end of the movable push rod 40 near the movable core 31, it prevents the movable core 31 from sticking to the movable push rod 40 due to the gap at the contact point between the movable core 31 and the movable push rod 40 being filled with lubricating oil, thereby allowing the movable core 31 to move smoothly axially away from the movable push rod 40.

[0066] Specifically, the missing slot 404 is implemented as a cross slot to facilitate the use of tools to rotate the movable push rod 40 when disassembling the push-pull electromagnet, thereby facilitating the removal of the movable push rod 40 from the push rod channel 1201.

[0067] Preferably, the push rod channel 1201 is manufactured by reaming and rolling processes to improve the surface accuracy of the inner wall of the push rod channel 1201. This improves the smoothness of the sliding of the seal 50 along the inner wall of the push rod channel 1201 and reduces the friction between the seal 50 and the inner wall of the push rod channel 1201 when the movable push rod 40 moves along the extension direction with the seal 50 in contact with the inner wall of the push rod channel 1201.

[0068] Those skilled in the art should understand that the embodiments of this application described above and shown in the accompanying drawings are merely examples and do not limit the scope of this application. The advantages of this application have been fully and effectively implemented. The functional and structural principles of this application have been demonstrated and explained in the embodiments, and any variations or modifications can be made to the implementation of this application without departing from the stated principles.

Claims

1. A push-pull electromagnet, characterized in that The push-pull electromagnet comprises: a housing forming an inner cavity, the housing being provided with a through channel and a push rod channel, the through channel and the push rod channel being coaxial and communicating with the inner cavity; at least two groups of coils coaxially arranged in the inner cavity, and an axial channel filled with lubricating oil being formed at the axial center of the two groups of coils, the through channel and the push rod channel being formed at two ends of the axial channel in the axial direction, the axial channel, the through channel and the push rod channel being coaxial and communicating with each other; a movable member comprising a movable core portion and a pushing portion, the movable core portion being movably installed in the axial channel in the axial direction of the axial channel and coaxial with the axial channel, and the pushing portion being arranged at the end of the movable core portion in the axial direction of the movable core portion and being capable of passing through and sliding in the through channel; a movable push rod coaxially arranged in the push rod channel in the axial direction of the push rod channel and partially penetrating the push rod channel, the movable push rod being provided with at least one oil groove and at least one sealing ring groove in the circumferential direction, the oil groove and the sealing ring groove being located in the push rod channel, the oil groove being filled with lubricating oil, the movable push rod being further provided with an oil passing space between the oil groove and the sealing ring groove in the extension direction of the movable push rod, and the oil groove and the sealing ring groove being in communication through the oil passing space; and at least one sealing member sleeved on the movable push rod and abutting against the inner wall of the push rod channel, the sealing member being arranged in the sealing ring groove.

2. The push-pull electromagnet of claim 1, wherein The oil groove and the oil passing space are both implemented as two, the two oil grooves and the two oil passing spaces being arranged on both sides of the sealing ring groove in the extension direction of the movable push rod, and the two oil grooves being in communication through one oil passing space.

3. The push-pull electromagnet according to claim 1 or 2, characterized in that In the axial cross section of the movable push rod, the oil groove presents a V shape.

4. The push-pull electromagnet of claim 3, wherein The push-pull electromagnet further comprises a guide pipe sleeve held in the axial channel in the axial direction of the axial channel and sleeved on the outer periphery of the movable core portion.

5. The push-pull electromagnet of claim 4, wherein The movable core portion is provided with at least one oil passing through hole in the direction parallel to the axial direction, both ends of the oil passing through hole in the extension direction being in communication with the axial channel. The push-pull electromagnet further comprises a guide pipe sleeve held in the axial channel in the axial direction of the axial channel and sleeved on the outer periphery of the movable core portion. The movable core portion is provided with at least one oil passing through hole in the direction parallel to the axial direction, both ends of the oil passing through hole in the extension direction being in communication with the axial channel.

6. The push-pull electromagnet of claim 5, wherein The shell has a front part and a rear part, the front part is located at the end of the shell away from the movable push rod, the through channel is opened in the front part coaxially and in communication with the axial channel, the rear part is located at the end of the shell close to the movable push rod, the push rod channel is opened in the rear part coaxially and in communication with the axial channel, the front part extends to the axial channel at the part where the through channel is opened to form a first inner buckle in a manner of keeping fit to the inner wall of the conduit sleeve, the rear part extends to the axial channel at the part where the push rod channel is opened to form a second inner buckle in a manner of keeping fit to the inner wall of the conduit sleeve.

7. The push-pull electromagnet of claim 6, wherein The push-pull electromagnet further comprises a magnetic isolation member, the magnetic isolation member is arranged at the end of the first inner buckle close to the moving core part, and the magnetic isolation member is located between the first inner buckle and the moving core part, the magnetic isolation member is made of non-magnetic material.

8. The push-pull electromagnet of claim 7, wherein The second inner buckle is circumferentially opened to accommodate space in the inner wall of the end part close to the moving core part, and the second inner buckle has a anti-falling step, the anti-falling step is formed at the bottom wall of the accommodating space in the axial direction of the push rod channel, the movable push rod extends radially at the end part close to the moving core part to form an anti-falling edge, the anti-falling edge is opposite to the anti-falling step in the axial direction of the accommodating space.

9. The push-pull electromagnet of claim 8, wherein, The movable push rod is opened at least one missing groove at one end part close to the moving core part.

10. The push-pull electromagnet of claim 5, wherein The oil passing through hole is opened as at least two, at least two oil passing through holes are opened in the moving core part in a uniform arrangement around the axis direction of the moving core part.

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