Mechanical hold contact

Abstract

The utility model belongs to circuit switch technical field discloses a kind of mechanical holding contactors, including sealed casing, static contact, moving contact, driving mechanism and mechanical holding assembly, mechanical holding assembly is located between driving mechanism and moving contact, driving mechanism can drive mechanical holding assembly from separation holding position switch to suction holding position when moving upward, moving contact and static contact contact suction, or from suction holding position switch to separation holding position, moving contact and static contact separate, after driving mechanism moves downward, mechanical holding assembly is kept in current position.The utility model position switching of mechanical holding assembly is driven and controlled by the movement of driving mechanism, it is beneficial to improve the switching reliability and switching efficiency of mechanical holding assembly, driving mechanism moves downward again after moving contact and static contact stable contact work, mechanical holding assembly is kept in current position, realize the mechanical holding of the state of mechanical holding contactor, with energy-saving and anti-vibration effect, and control mode is simple and reliable.

Description

Technical Field

[0001] This utility model relates to the field of circuit switch technology, and in particular to a mechanical holding contactor. Background Technology

[0002] A DC contactor is a contactor whose iron core is controlled by a DC coil. The structure of a DC contactor generally includes a sealed housing and stationary contacts, contact plates, and a drive mechanism installed within the sealed housing cavity. The drive mechanism uses electromagnetic drive and mainly includes a drive coil, a moving iron core, a push rod, and a return spring. The contact plates are arranged vertically opposite to the stationary contacts. When the drive coil is energized, the contact plates move towards the stationary contacts under magnetic force until they make contact, and the DC contactor is in a closed working state. When the drive coil is de-energized, the contact plates reset under the action of the return spring and disconnect from the stationary contacts, and the DC contactor is in an open, non-operating state. When the DC contactor is in the closed working state, the drive coil must be continuously energized, resulting in high power consumption and heat generation. Furthermore, it cannot maintain contact closure under power failure or voltage drop conditions, meaning it cannot achieve power-off self-holding. Utility Model Content

[0003] The purpose of this invention is to provide a mechanical holding contactor that solves the problem that DC contactors cannot maintain their position when power is off.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A mechanically retaining contactor includes a sealed housing and a stationary contact, a moving contact, and a driving mechanism installed within the sealed housing. The driving mechanism can drive the moving contact to rise to contact the stationary contact or drive the moving contact to fall to separate from the stationary contact. The mechanically retaining contactor also includes a mechanically retaining assembly, which has an engaging retaining position and a disengaged retaining position. The mechanically retaining assembly is located between the driving mechanism and the moving contact. When the driving mechanism moves upward, it can drive the mechanically retaining assembly to switch from the disengaged retaining position to the engaging retaining position, whereby the moving contact engages with the stationary contact, or switch from the engaging retaining position to the disengaged retaining position, whereby the moving contact separates from the stationary contact. When the driving mechanism moves downward, the mechanically retaining assembly remains in its current position.

[0006] In some embodiments, the mechanical holding assembly includes a locking member and a movable member, the movable member slidingly passing through the locking member, the locking member having an engaging holding position and a disengaged holding position; the driving mechanism includes a push rod, the top end of the push rod being connected to the movable contact piece, the push rod having a pushing portion, the pushing portion having alternating and spaced first ratchet teeth and second ratchet teeth along the circumferential direction, the first ratchet teeth corresponding one-to-one with the disengaged holding position along the axial direction of the push rod, the second ratchet teeth corresponding one-to-one with the engaging holding position along the radial direction of the push rod; when the push rod rises, the first ratchet teeth abut against the movable member and rise to disengage from the locking member, the movable member switches from the disengaged holding position to the engaging holding position, the movable contact piece contacts and closes with the stationary contact and remains in place; when the push rod rises again, the second ratchet teeth abut against the movable member and rise to disengage from the locking member, the movable member switches from the engaging holding position to the disengaged holding position, the movable contact piece separates from and remains with the stationary contact.

[0007] In some embodiments, the first ratchet tooth has a first inclined surface at its tip, the second ratchet tooth has a second inclined surface at its tip, and the bottom of the movable member has a third inclined surface. When the push rod rises, the first inclined surface or the second inclined surface slides against the third inclined surface.

[0008] In some embodiments, the movable member is sleeved on the push rod and rotatably connected to the push rod. The outer side wall of the movable member is provided with a guide vane, and the bottom end of the guide vane is provided with the third inclined surface. When the movable member is in the separation holding position, the guide vane is slidably disposed in the separation holding position.

[0009] In some embodiments, the locking member is provided with a ratchet groove, the groove wall of the ratchet groove is provided with a plurality of third ratchet teeth, the plurality of third ratchet teeth are spaced apart along the circumferential sidewall of the ratchet groove, the gap between two adjacent third ratchet teeth forms the separation holding position, the guide vane can slide through the separation holding position, and the tooth tip of the third ratchet tooth is provided with the engagement holding position.

[0010] In some embodiments, the tip of the third ratchet tooth is provided with a fourth inclined surface inclined toward the disengagement holding position and a fifth inclined surface inclined toward the engagement holding position, and the third inclined surface can slide into the disengagement holding position or the engagement holding position by sliding into the fourth inclined surface or the fifth inclined surface.

[0011] In some embodiments, the third ratchet tooth has a clearance position on the side facing the center of the ratchet groove. When the push rod pushes the movable part to rise, the first ratchet tooth and the second ratchet tooth pass through the separation holding position and the clearance position respectively, pushing the movable part to the third inclined surface to connect with the fifth inclined surface or the fourth inclined surface.

[0012] In some embodiments, the clearance position is located between the fourth inclined surface and the fifth inclined surface. When the second ratchet tooth passes through the clearance position, it can push the movable member from the fifth inclined surface upward and rotate before sliding to the fourth inclined surface.

[0013] In some embodiments, the mechanical retaining assembly further includes a first elastic member, the inner wall of the movable member is provided with a stepped surface, the bottom end of the first elastic member abuts against the stepped surface, and the top end of the first elastic member abuts against the movable contact piece. Under the action of the first elastic member, the movable member always has a downward movement tendency.

[0014] In some embodiments, a mounting groove is provided at the bottom of the sealing housing. When the movable contact is separated from the stationary contact, the pushing part is located in the mounting groove and abuts against the bottom of the mounting groove for limitation. The top of the movable member slides completely into the locking member, and the movable contact abuts against the end face of the locking member.

[0015] The beneficial effects of this utility model are:

[0016] The mechanical holding contactor provided by this utility model includes a mechanical holding assembly. When the drive mechanism moves upward under the electromagnetic force of an external coil, the mechanical holding assembly switches from the disengaged holding position to the engaged holding position, or vice versa. When the drive mechanism is driven by a short-term external electromagnetic force, it drives the mechanical holding assembly to switch positions, which helps to improve the switching reliability and efficiency of the mechanical holding assembly. After the moving contact and the stationary contact have made stable contact, when the drive mechanism moves downward again, the mechanical holding assembly remains in its current position, realizing the self-holding of the mechanical holding contactor when power is cut off. It has energy-saving and anti-vibration effects, and the control method is simple and reliable. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the mechanical holding contactor provided in this embodiment of the utility model;

[0018] Figure 2 This is a cross-sectional view of the mechanical retaining contactor provided in an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the internal structure of the mechanical retaining contactor provided in this embodiment of the utility model (with the sealing housing removed);

[0020] Figure 4 This is a schematic diagram showing the cooperative relationship between the push rod, locking element, and moving element in the mechanical holding contactor provided in this embodiment of the utility model (the moving element is in the separated holding position);

[0021] Figure 5 This is a schematic diagram of the pusher portion in the mechanical retaining contactor provided in this embodiment of the utility model;

[0022] Figure 6 This is a top view of the pushing part in the mechanical retaining contactor provided in this embodiment of the utility model;

[0023] Figure 7 This is a schematic diagram of the structure of the moving part in the mechanically retaining contactor provided in this embodiment of the utility model;

[0024] Figure 8 This is a schematic diagram of the locking element in the mechanically retaining contactor provided in this embodiment of the utility model;

[0025] Figure 9 This is a top view of the locking element in the mechanically retaining contactor provided in this embodiment of the utility model.

[0026] In the picture:

[0027] 1. Sealed housing; 2. Stationary contact; 3. Moving contact piece; 4. Drive mechanism; 41. Push rod; 42. Pushing part; 43. First ratchet tooth; 431. First inclined surface; 44. Second ratchet tooth; 441. Second inclined surface; 5. Locking element; 51. Ratchet groove; 52. Third ratchet tooth; 53. Engagement holding position; 54. Disengagement holding position; 55. Fourth inclined surface; 56. Fifth inclined surface; 57. Clearance position; 6. Moving part; 61. Guide vane; 62. Third inclined surface; 63. Stepped surface; 7. First elastic element. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0029] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0032] This utility model embodiment provides a mechanical retaining contactor, such as Figures 1-3 The device includes a sealed housing 1 and a stationary contact 2, a moving contact 3, a drive mechanism 4, and a mechanical holding assembly installed within the sealed housing 1. The drive mechanism can drive the moving contact 3 to rise to contact the stationary contact, or drive the moving contact 3 to fall to separate from the stationary contact. The mechanical holding assembly has a pull-in holding position 53 and a release holding position 54. The mechanical holding assembly is located between the drive mechanism 4 and the moving contact 3. When the drive mechanism 4 moves upward, it can drive the mechanical holding assembly to switch from the release holding position 54 to the pull-in holding position 53, whereby the moving contact 3 contacts and engages with the stationary contact 2, or switch from the pull-in holding position 53 to the release holding position 54, whereby the moving contact 3 separates from the stationary contact 2. After the drive mechanism 4 moves downward, the mechanical holding assembly remains in its current position.

[0033] By setting the mechanical holding assembly to a closed holding position 53 and a closed holding position 54, when the mechanical holding assembly is in the closed holding position 53, the moving contact 3 and the stationary contact 2 are in contact. When the mechanical holding assembly is in the closed holding position 54, the moving contact 3 and the stationary contact 2 are separated. The position is switched by short-term drive control of the drive mechanism 4, which helps to improve the switching reliability and switching efficiency of the mechanical holding assembly. After the moving contact 3 and the stationary contact 2 are in stable contact, the drive mechanism 4 moves downward and the mechanical holding assembly remains in the current position, realizing the self-holding of the mechanical holding contactor when the power is off. It has energy-saving and anti-vibration effects, and the control method is simple and reliable.

[0034] In some embodiments, the mechanical holding assembly includes a locking member 5 and a movable member 6, which mechanically hold the contact state and separation state of the movable contact 3 and the stationary contact 2. The driving mechanism 4 can drive the movable contact 3 to rise to contact the stationary contact 2, or drive the movable contact 3 to descend to separate from the stationary contact 2; the movable member 6 slides through the locking member 5, which has a suction holding position 53 and a separation holding position 54, corresponding to the suction state and separation state of the movable contact 3 and the stationary contact 2, respectively; the driving mechanism 4 includes a push rod 41, the top end of which is connected to the movable contact 3, and the push rod 41 has a pushing portion 42. The pushing portion 42 is circumferentially spaced with first ratchet teeth 43 and second ratchet teeth 44. The first ratchet teeth 43 and the separation holding positions 54 are arranged one-to-one along the axial direction of the push rod 41. The ratchet teeth 44 and the engagement holding position 53 are arranged one-to-one in the radial direction of the push rod 41. When the drive coil of the drive mechanism 4 is subjected to the electromagnetic force of the external coil, the push rod 41 rises, that is, moves upward. After the first ratchet tooth 43 abuts against the movable member 6 and rises to disengage from the locking member 5, the movable member 6 switches from the disengagement holding position 54 to the engagement holding position 53, and the moving contact 3 contacts and closes with the stationary contact 2 and remains in place. When the push rod 41 rises again, the second ratchet tooth 44 abuts against the movable member 6 and rises to disengage from the locking member 5, and the movable member 6 switches from the engagement holding position 53 to the disengagement holding position 54, and the moving contact 3 separates from and remains with the stationary contact 2.

[0035] The mechanical holding contactor provided by this utility model uses an external coil as the driving coil of the drive mechanism 4, which drives the push rod 41 to move upward and downward to push the moving contact 3 to move up and down. This is existing technology and will not be elaborated on in this embodiment. Only the improvement points will be described in detail. It can be understood that the upward movement of the push rod 41 is driven by the electromagnetic force generated by external power. When the external power is turned off, the electromagnetic force disappears, and the push rod 41 descends. The descent of the push rod 41 is also a reset action under the action of gravity. Therefore, short-term external power allows the push rod 41 to be held in the rising position for a short time to facilitate the switching process of the mechanical holding assembly; external power failure causes the push rod 41 to move downward. The mechanical retaining contactor of this utility model embodiment includes a locking member 5, which is fixed to the inner side of the bottom wall of the sealing housing 1. The locking member 5 is a flat plate, and its axial thickness is less than the axial height of the movable member 6. The pushing part 42 on the push rod 41 can push the movable member 6 to slide up and down along the locking member 5. The locking member 5 helps to reduce the overall height of the mechanical retaining contactor and saves the installation space in the sealing housing 1. The plate-shaped locking member 5 can contact the surface of the sealing housing 1, which improves the structural stability. By setting the movable part 6 and the locking part 5, the movable part 6 can be switched between the engaging and disengaging positions 53 and 54 on the locking part 5, thereby achieving the switching control of the on / off state of the moving contact 3 and the stationary contact 2. The engaging and disengaging positions 53 and 54 mechanically lock the movable part 6, improving the reliability of the contact or disengagement state of the moving contact 3 and the stationary contact 2. The position switching control of the movable part 6 is achieved by controlling the rising and falling motion of the push rod 41. The switching method is simple and energy-saving, avoiding the power consumption and component wear caused by long-term energization. Multiple first ratchet teeth 43 and multiple second ratchet teeth 44 are alternately and spaced along the circumference on the pushing part 42. Combining the unidirectional characteristics of the first ratchet teeth 43 and the second ratchet teeth 44, the movable part 6 can only rotate in one direction to switch states after rising to the position. Compared with the gear-operated pushing in the prior art, the directional rotation of the movable part 6 is more certain and reliable, thereby improving the reliability of state switching. After each upward movement of the push rod 41, the first ratchet tooth 43 and the second ratchet tooth 44 alternately abut against the movable part 6, realizing the automatic switching of the movable part 6 between the engaging holding position 53 and the disengaged holding position 54 after rotating a certain angle. After the push rod 41 moves downward, the movable part 6 remains in the engaging holding position 53 or the disengaged holding position 54, realizing mechanical holding and facilitating energy saving. After the push rod 41 rises again, the movable part 6 rises again and rotates to switch. The position switching of the movable part 6 is achieved by controlling the multiple lifting and lowering movements of the push rod 4. Compared with the reverse power supply control in the prior art, the control method is simple and improves the switching efficiency and reliability of the movable part 6.The position of the movable part 6 after each rotation corresponds to the first ratchet tooth 43 or the second ratchet tooth 44. The engaging holding position 53 is set to correspond to the second ratchet tooth 44, and the disengaging holding position 54 is set to correspond to the first ratchet tooth 43, thereby improving the accuracy of the switching position and the switching efficiency of the movable part 6.

[0036] In some embodiments, the first ratchet tooth 43 has a first inclined surface 431 at its tooth end, the second ratchet tooth 44 has a second inclined surface 441 at its tooth end, and the bottom end of the movable member 6 has a third inclined surface 62. When the push rod 41 rises, the first inclined surface 431 or the second inclined surface 441 slides against the third inclined surface 62.

[0037] like Figure 3 The pushing part 42 is sleeved and fixed on the push rod 41, or integrally formed with the push rod 41. The movable part 6 is located between the pushing part 42 and the movable contact piece 3 and is elastically abutted. Eight unidirectional teeth are evenly spaced on the outer peripheral wall of the pushing part 42, such as... Figure 8 and Figure 9 The ratchet consists of four alternating first ratchet teeth 43 and four second ratchet teeth 44. The four first ratchet teeth 43 and four second ratchet teeth 44 are arranged alternately and at intervals. The tooth ends of the first ratchet teeth 43 are provided with a first inclined surface 431, and the tooth ends of the second ratchet teeth 44 are provided with a second inclined surface 441. The first inclined surface 431 and the second inclined surface 441 have the same inclination direction. The first inclined surface 431 and the third inclined surface 62, as well as the second inclined surface 441 and the third inclined surface 62, are in planar contact and elastically abut against each other. The structure is stable, and the moving part 6 always has the tendency to slide downward along the first inclined surface 431 or the second inclined surface 441. When push rod 41 rises, the movable part 6 and the pushing part 42 slide through the locking part 5 and are rotated and limited. The third inclined surface 62 abuts against the first inclined surface 431 and rises, or the third inclined surface 62 abuts against the second inclined surface 441 and rises, until the movable part 6 disengages from the rotation limit of the locking part 5. Relative sliding occurs between the third inclined surface 62 and the first inclined surface 431, or between the third inclined surface 62 and the second inclined surface 441. The movable part 6 rotates while sliding downward, gradually sliding into the engaging holding position 53 or the disengaging holding position 54. At this time, push rod 41 can move downward. After push rod 41 descends and resets, the movable part 6 is locked in the engaging holding position 53 or the disengaging holding position 54, realizing the mechanical holding of the current position. It is understandable that by setting up sliding contact between the inclined surfaces, since the movable part 6 elastically abuts between the moving contact piece 3 and the pushing part 42, the movable part 6 always has a downward movement tendency. When the push rod 41 pushes the movable part 6 upward, the movement tendency is enhanced, and the force between the first inclined surface 431 or the second inclined surface 441 and the third inclined surface 62 increases, which in turn facilitates the rapid sliding of the movable part 6 to achieve switching and improves the switching efficiency.

[0038] In some embodiments, the movable member 6 is sleeved on the push rod 41 and rotatably connected to the push rod 41. The outer side wall of the movable member 6 is provided with a guide blade 61, and the bottom end of the guide blade 61 is provided with a third inclined surface 62. When the movable member 6 is in the separation holding position 54, the guide blade 61 is slidably disposed in the separation holding position 54.

[0039] like Figure 7 As shown, the guide vane 61 protrudes along the outer side wall of the movable member 6 and extends axially. The axial length of the guide vane 61 can be greater than the length of the movable member 6, that is, it protrudes from the bottom end of the movable member 6, so that the third inclined surface 62 on the guide vane 61 can cooperate and abut with the first inclined surface 431 or the second inclined surface 441 on the pushing part 42. Figure 5 and Figure 6 The first ratchet tooth 43 and the second ratchet tooth 44 protrude around the outer peripheral wall of the pusher 42. Along the axial direction of the push rod 41, the guide vane 61 is always positioned opposite the first ratchet tooth 43 or the second ratchet tooth 44. When the movable part 6 is in the separated holding position 54, such as... Figure 4 The guide vane 61 is slidably positioned in the separation holding position 54. Under the action of the push rod 41 moving downward, the push rod 41 drives the top moving contact piece 3 to descend and press down the movable member 6, so that the movable member 6 continues to slide downward along the separation holding position 54 until it slides and abuts against the push part 42 again, thus realizing the complete separation of the moving contact piece 3 and the stationary contact 2.

[0040] In some embodiments, the locking member 5 is provided with a ratchet groove 51, and a plurality of third ratchet teeth 52 are protruding from the groove wall of the ratchet groove 51. The plurality of third ratchet teeth 52 are spaced apart along the circumferential sidewall of the ratchet groove 51. The gap between two adjacent third ratchet teeth 52 forms a separation holding position 54. The guide vane 61 can slide through the separation holding position 54. The tooth tip of the third ratchet tooth 52 is provided with a suction holding position 53.

[0041] like Figure 8 and Figure 9The locking member 5 is a flat plate, which helps to save material and axial space. The locking member 5 is fixedly installed at the bottom of the sealing housing 1. The ratchet groove 51 is a through groove, and both the pushing part 42 and the movable member 6 can slide up and down along the ratchet groove 51 and rotate to a limited position. The third ratchet tooth 52 is set out to protrude from the upper surface of the ratchet groove 51, so that the relatively small thickness of the locking member 5 can achieve a sufficiently high suction holding position 53. Taking four third ratchet teeth 52 spaced apart on the groove wall of the ratchet groove 51 as an example, the four third ratchet teeth 52 are spaced apart circumferentially to form a gap, which is the separation holding position 54. The four guide vanes 61 of the movable member 6 can slide in the four separation holding positions 54 respectively. It can be understood that the through-type separation holding position 54 facilitates the movable member 6 to slide down to the lowest point so as to achieve reliable separation of the moving contact 3 and the stationary contact 2. The engagement holding position 53 is located at the tooth end of the third ratchet tooth 52, so that the lowest position of the engagement holding position 53 is higher than the highest position of the disengagement holding position 54. When the movable member 6 is in the engagement holding position 53, according to the unidirectional nature of the ratchet, the movable member 6 is mechanically limited to the engagement holding position 53, so that the moving contact 3 and the stationary contact 2 can reliably contact each other.

[0042] In some embodiments, the tip of the third ratchet tooth 52 is provided with a fourth inclined surface 55 that is inclined downward toward the separation holding position 54 and a fifth inclined surface 56 that is inclined downward toward the engagement holding position 53. The third inclined surface 62 can slide into contact with the fourth inclined surface 55 or the fifth inclined surface 56 to slide into the separation holding position 54 or into the engagement holding position 53.

[0043] For example Figure 8 The fourth inclined surface 55 and the fifth inclined surface 56 can respectively connect and contact with the third inclined surface 62, so that the movable part 6 can slide along the fourth inclined surface 55 or the fifth inclined surface 56 to achieve position switching. It can be understood that when the pushing part 42 pushes the movable part 6 upward to the first inclined surface 431 and the fourth inclined surface 55, or the second inclined surface 441 and the fifth inclined surface 56, the bottom end of the guide blade 61 of the movable part 6 disengages from the locking part 5, and the third inclined surface 62 slides down along the first inclined surface 431 or the second inclined surface 441 into the fourth inclined surface 55 or the fifth inclined surface 56, and finally slides into the suction holding position 53. The one-way stop limit of the ratchet is used to realize the reliable switching and position holding of the movable part 6.

[0044] In some embodiments, the third ratchet tooth 52 is provided with a clearance position 57 on the side facing the center of the ratchet groove 51. When the push rod 41 pushes the movable member 6 to rise, the first ratchet tooth 43 and the second ratchet tooth 44 respectively pass through the separation holding position 54 and the clearance position 57, pushing the movable member 6 to the third inclined surface 62 to connect with the fifth inclined surface 56 or the fourth inclined surface 55.

[0045] like Figure 5As shown, the ratchet groove 51 has a first aperture, and four third ratchet teeth 52 protrude from the inner wall of the ratchet groove 51 to form a second aperture. A clearance seat 57 is provided on the inner side wall of each third ratchet tooth 52 to form a third aperture. The third aperture is between the first aperture and the second aperture. It can be understood that the first ratchet tooth 43 engages with the separation holding position 54 for movement, therefore the outer diameter of the first ratchet tooth 43 engages with the first aperture. The second ratchet tooth 44 engages with the clearance seat 57 for movement, therefore the outer diameter of the second ratchet tooth 44 engages with the third aperture. That is, the radial width of the first ratchet tooth 43 is greater than the radial width of the second ratchet tooth 44, thus providing a rotational limit when the first ratchet tooth 43 engages with the separation holding position 54, allowing the push rod 41 to only move up and down. Figure 6 The clearance position 57 is located between the fourth inclined plane 55 and the fifth inclined plane 56. When the second ratchet tooth 44 passes through the clearance position 57, it can push the movable part 6 from the fifth inclined plane 56 to rise and rotate before sliding to the fourth inclined plane 55. It is understood that, along the circumferential direction, the clearance position 57 is directly opposite the engagement and holding position 53, which is achieved by opening notches on the fifth inclined surface 56 and the fourth inclined surface 55 respectively. At the clearance position 57, the radial width of the third inclined surface 62 is greater than the width of the fourth inclined surface 55, and the radial width of the third inclined surface 62 is greater than the width of the fifth inclined surface 56. That is, the movable member 6 can contact the pushing part 42 and the locking member 5 at the same time to facilitate switching. Specifically, when the second ratchet tooth 44 passes through the clearance position 57 from bottom to top, the second ratchet tooth 44 can contact a part of the inclined surface of the third inclined surface 62 of the movable member 6 in the engagement and holding position 53, and push the movable member 6 from the fifth inclined surface 56 and rise to the fourth inclined surface 55 to connect with the third inclined surface 62. After that, the movable member 6 slides into the separation and holding position 54 along the fourth inclined surface 55. Furthermore, the first inclined surface 431, the second inclined surface 441, the fourth inclined surface 55 and the fifth inclined surface 56 have the same inclination angle to facilitate good surface contact with the third inclined surface 62, ensuring smooth sliding and position switching of the movable part 6.

[0046] In some embodiments, the mechanical retaining contactor further includes a first elastic element 7, the inner wall of the movable element 6 is provided with a stepped surface 63, the bottom end of the first elastic element 7 abuts against the stepped surface 63, and the top end of the first elastic element 7 abuts against the movable contact piece 3. Under the action of the first elastic element 7, the movable element 6 always has a downward movement tendency.

[0047] like Figure 2 and Figure 4As shown, the first elastic element 7 can be a spring. The first elastic element 7 is sleeved on the push rod 41, and its two ends abut against the movable element 6 and the movable contact plate 3, respectively. Since the movable contact plate 3 is fixedly connected to the top end of the push rod 41, the top end of the first elastic element 7 can also directly abut against the push rod 41. Under the elastic force of the first elastic element 7, the movable element 6 always has a downward tendency. Of course, in other optional embodiments, the first elastic element 7 can also be an elastic element such as a spring sheet.

[0048] In some embodiments, a mounting groove is provided at the bottom of the sealing housing 1. When the movable contact 3 is separated from the stationary contact 2, the pushing part 42 is located in the mounting groove and abuts against the bottom of the mounting groove for limitation. The top of the movable member 6 slides completely into the ratchet groove 51, and the movable contact 3 abuts against the end face of the locking member 5.

[0049] like Figure 2 As shown, by providing a mounting groove at the bottom of the sealed housing 1, the push rod 41 passes through the bottom of the mounting groove, and the pushing part 42 is located inside the mounting groove. When the pushing part 42 descends to its lowest position, it contacts the bottom of the mounting groove to achieve a lower limit. By providing the mounting groove, the direction of the pushing part 42's lifting and lowering can be guided. It can be understood that the mounting groove, ratchet groove 51, and push rod 41 are coaxially arranged. Figure 3 When the push rod 41 returns to its lowest position, the push rod 41 drives the movable contact piece 3 to descend. The top of the movable contact piece 3 or the push rod 41 can press the movable part 6 into the ratchet groove 51, and the bottom third inclined surface 62 of the movable part 6 slides against the second inclined surface 441, preparing for the next action.

[0050] By using the mechanical holding contactor provided by this utility model, after each upward movement of the push rod 41 and short-term holding, the movable part 6 can be pushed up and the position can be switched. After the push rod 41 moves downward, the movable part 6 can be held in the current position, thereby improving the reliability of switching and holding. The control method is simple and reliable, and solves the problems of high power consumption and high heat in the power-on holding.

[0051] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A mechanical contact maintainer comprising a sealed housing (1) and a stationary contact (2), a movable contact (3) and a drive mechanism (4) mounted in the sealed housing (1), the drive mechanism (4) being capable of driving the movable contact (3) to rise into contact with the stationary contact (2) or to fall out of contact with the stationary contact (2); characterized in that, The mechanical retaining contactor further includes a mechanical retaining assembly, which has an engaging retaining position (53) and a disengaging retaining position (54). The mechanical retaining assembly is located between the driving mechanism (4) and the moving contact piece (3). When the driving mechanism (4) moves upward, it can drive the mechanical retaining assembly to switch from the disengaging retaining position (54) to the engaging retaining position (53), whereby the moving contact piece (3) engages with the stationary contact (2), or switches from the engaging retaining position (53) to the disengaging retaining position (54), whereby the moving contact piece (3) separates from the stationary contact (2). After the driving mechanism (4) moves downward, the mechanical retaining assembly remains in its current position.

2. The mechanical hold contact according to claim 1, characterized in that The mechanical retaining assembly further includes a locking member (5) and a movable member (6). The movable member (6) slides through the locking member (5). The locking member (5) has the engaging retaining position (53) and the disengaging retaining position (54). The driving mechanism (4) includes a push rod (41). The top end of the push rod (41) is connected to the moving contact piece (3). The push rod (41) has a pushing part (42). The pushing part (42) has alternating and spaced first ratchet teeth (43) and second ratchet teeth (44) along the circumferential direction. The first ratchet teeth (43) and the disengaging retaining position (54) are arranged one-to-one along the axial direction of the push rod (41). The second ratchet teeth (44) and the engaging retaining position are arranged one-to-one along the axial direction of the push rod (41). (53) They are arranged one-to-one in the radial direction of the push rod (41); when the push rod (41) rises, the first ratchet tooth (43) abuts against the movable part (6) and rises to disengage from the locking part (5), the movable part (6) switches from the separated holding position (54) to the attracted holding position (53), and the moving contact piece (3) contacts and closes with the stationary contact (2) and remains there; when the push rod (41) rises again, the second ratchet tooth (44) abuts against the movable part (6) and rises to disengage from the locking part (5), the movable part (6) switches from the attracted holding position (53) to the separated holding position (54), and the moving contact piece (3) separates from and remains with the stationary contact (2).

3. The mechanical retaining contactor according to claim 2, characterized in that, The first ratchet tooth (43) has a first inclined surface (431) at its tooth end, the second ratchet tooth (44) has a second inclined surface (441) at its tooth end, and the bottom end of the movable part (6) has a third inclined surface (62). When the push rod (41) rises, the first inclined surface (431) or the second inclined surface (441) slides against the third inclined surface (62).

4. The mechanical retaining contactor according to claim 3, characterized in that, The movable part (6) is sleeved on the push rod (41) and rotatably connected to the push rod (41). The outer side wall of the movable part (6) is provided with a guide blade (61). The bottom end of the guide blade (61) is provided with the third inclined surface (62). When the movable part (6) is in the separation holding position (54), the guide blade (61) is slidably disposed in the separation holding position (54).

5. The mechanical retaining contactor according to claim 4, characterized in that, The locking member (5) is provided with a ratchet groove (51), and a plurality of third ratchet teeth (52) are protruding from the groove wall of the ratchet groove (51). The plurality of third ratchet teeth (52) are spaced apart along the circumferential sidewall of the ratchet groove (51). The gap between two adjacent third ratchet teeth (52) forms the separation holding position (54). The guide vane (61) can slide through the separation holding position (54). The tooth tip of the third ratchet tooth (52) is provided with the suction holding position (53).

6. The mechanical retaining contactor according to claim 5, characterized in that, The third ratchet tooth (52) has a fourth inclined surface (55) inclined toward the separation holding position (54) and a fifth inclined surface (56) inclined toward the engagement holding position (53) at its tooth tip. The third inclined surface (62) can slide into the separation holding position (54) or the engagement holding position (53) by sliding into the fourth inclined surface (55) or the fifth inclined surface (56).

7. The mechanical retaining contactor according to claim 6, characterized in that, The third ratchet tooth (52) has a clearance position (57) on the side facing the center of the ratchet groove (51). When the push rod (41) pushes the movable part (6) to rise, the first ratchet tooth (43) and the second ratchet tooth (44) pass through the separation holding position (54) and the clearance position (57) respectively, pushing the movable part (6) to the third inclined surface (62) to connect with the fifth inclined surface (56) or the fourth inclined surface (55).

8. The mechanical retaining contactor according to claim 7, characterized in that, The clearance position (57) is located between the fourth inclined surface (55) and the fifth inclined surface (56). When the second ratchet tooth (44) passes through the clearance position (57), it can push the movable part (6) from the fifth inclined surface (56) upward and rotate before sliding to the fourth inclined surface (55).

9. The mechanical retaining contactor according to claim 2, characterized in that, The mechanical retaining assembly further includes a first elastic element (7), and the inner wall of the movable element (6) is provided with a stepped surface (63). The bottom end of the first elastic element (7) abuts against the stepped surface (63), and the top end of the first elastic element (7) abuts against the movable contact piece (3). Under the action of the first elastic element (7), the movable element (6) always has a downward movement tendency.

10. The mechanical retaining contactor according to claim 2, characterized in that, The bottom of the sealed housing (1) is provided with an installation groove. When the moving contact (3) is separated from the stationary contact (2), the pushing part (42) is located in the installation groove and abuts against the bottom of the installation groove for limitation. The top of the movable part (6) slides completely into the locking part (5), and the moving contact (3) abuts against the end face of the locking part (5).

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