Secondary locking mechanism and high-voltage connector

Abstract

The invention discloses a secondary locking mechanism and a high-voltage connector, the secondary locking mechanism comprises a plug shell and a socket shell, a primary locking plate is erected on the plug shell, a group of stop blocks are arranged on the end face of the same side of the socket shell, the far end of the primary locking plate is clamped with the group of stop blocks to form a primary locking mechanism, and the primary locking mechanism is connected with the socket shell. A jack is formed between the primary locking plate and the end face of the plug shell, a secondary locking plate is movably inserted in the jack, a limiting clamping strip is arranged on the end face of the socket shell, a first clamping arm is arranged at the far end of the secondary locking plate, a slot is formed in the far end of the first clamping arm, and the second clamping arm is movably inserted in the slot. The secondary locking piece drives the slot to be clamped with the limiting clamping strip through axial movement to form a secondary locking mechanism, and when the plug shell and the socket shell are in a secondary locking state, the first clamping arm is located at the bottom of the first pressing part and the bottom of the second pressing part at the same time, and the second clamping arm is located at the bottom of the second pressing part. And the primary locking plate is propped against the primary locking mechanism to lock the primary locking mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of connectors, and in particular to a secondary locking mechanism and a high-voltage connector. Background Art

[0002] As a connector that requires high-voltage current to flow, the safety of high-voltage interlocking connectors makes their manufacture critical. During the process of unlocking and unplugging the connector, it is possible that the connector will be unplugged while it is energized. This phenomenon can cause erosion of the contacts and even the connector, causing damage to the vehicle and the operator. Therefore, high-voltage connectors need to consider the time interval when the interlocking signal circuit and the power circuit are disconnected. To address this problem, some connectors that can achieve step-by-step disconnection of the interlocking signal circuit and the power circuit have appeared on the market. Most of them form two locking structures through levers. As disclosed in patent CN103066451A, when unlocking, two unlocking operations are achieved by pressing the first hook and the second hook respectively, thereby unplugging the connector from the matching socket connector.

[0003] In the face of this kind of locking structure that realizes step-by-step connection between wet and dry, it is usually equipped with an inserted locking block to form a secondary lock, and such a locking block is usually provided with a hook structure at its bottom or front end to achieve the locking connection, so as to achieve the anti-slip effect. As disclosed in announcement number CN 216214505 U, its secondary locking piece is provided with a hook at its front end to engage with the shell. Such a locking structure needs to maintain contact with the shell during use, thereby generating hard friction, making the hook structure at its front end easily worn and flat; at the same time, the hook structure makes it difficult to pull out, requiring a large pulling force, which can easily cause the hook structure to break, resulting in the problem of locking failure. Therefore, how to quickly realize the secondary locking function while improving the user experience and convenience is a problem that is currently in urgent need of solution. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a secondary locking mechanism and a high-voltage connector.

[0005] The purpose of the present invention is achieved through the following technical solutions: A secondary locking mechanism comprises a plug housing and a socket housing connected to each other for plugging and unplugging, a primary locking piece is mounted on one end face of the plug housing, and a group of blocks are arranged on the same end face of the socket housing, the distal end of the primary locking piece is engaged with the group of blocks to form a primary locking mechanism for locking the plug housing and the socket housing in an engaged state, the primary locking piece extends straight and its middle portion is fixed to the plug housing, the distal end and proximal end of the primary locking piece form a first pressing portion and a second pressing portion that can perform a seesaw action relative to the middle portion, and the primary locking mechanism completes step-by-step unlocking by alternately pressing the first pressing portion and the second pressing portion; the primary locking piece and the plug housing are engaged with each other, and the primary locking piece is engaged with each other, and the primary locking mechanism is engaged with each other, and the primary locking piece ... The locking mechanism is configured to lock the socket housing when the locking cam is in a locked state and to lock the locking cam when the locking cam is in a locked state.

[0006] Preferably, a group of the stops includes a first stop and a second stop, the first stop and the second stop have a distance difference in the axial direction, and the first stop is closer to the proximal end of the socket housing, the front end of the primary locking plate is relatively provided with two clamping arms, and a bayonet is formed between the inner ends of the clamping arms that can be engaged with the first stop; the two second stops are respectively arranged on both sides of the first stop, and the outer ends of the clamping arms can be engaged with the second stop.

[0007] Preferably, a group of the stops includes a first stop and a second stop, the first stop and the second stop have a distance difference in the axial direction, and the second stop is closer to the proximal end of the socket housing, and the front end of the primary locking plate is relatively provided with two clamping arms, and the inner ends of the clamping arms can be engaged with the first stop; the two second stops are respectively arranged on both sides of the first stop, and the outer ends of the clamping arms can be engaged with the second stop.

[0008] Preferably, the proximal bottom surface of the first stop block is formed with a first driving inclined surface that can drive the inner end to move downward, and the proximal top surface of the second stop block is formed with a second driving inclined surface that can drive the outer end to move upward; a first gap is formed between the bottom surface of the first stop block and the end surface of the socket shell, and the height of the first gap is greater than the thickness of the inner end, so that the clamping connection between the inner end and the first stop block can be unlocked by pressing down the first pressing portion; a second gap is formed between the bottom surface of the inner end and the end surface of the socket shell, and the height of the second stop block is greater than the second gap, so that the clamping connection between the outer end and the second stop block can be unlocked by pressing down the second pressing portion.

[0009] Preferably, the proximal end of the first stop block is fixedly connected to the distal end of the limiting clip.

[0010] Preferably, the first clamping arm is composed of two support arms that are symmetrically arranged at intervals, and the slot is formed between the two support arms. The proximal end of the limiting clamping strip has a head with a width greater than its extension part, and the two support arms have elasticity that can move relative to each other to form an opening that can be opened and closed to allow the head to be clamped into the slot.

[0011] Preferably, the inner wall of the support arm is provided with a limiting recess matching the head, the head is clamped between the two limiting recesses, and the proximal sides of the head, the sides of the opening, and the sides of the limiting recess are all inclined surfaces with matching inclinations.

[0012] Preferably, protrusions are symmetrically provided on the inner walls of the two support arms, and a limiting groove is formed between the proximal end of the protrusion and the proximal end of the support arm. An axially extending fixing block is fixed on the end face of the plug shell. When the plug shell and the socket shell are in the secondary locking state, the fixing block is located in the limiting groove, and the two sides of the distal end of the fixing block and the two sides of the distal end of the limiting groove are inclined surfaces with the same inclination.

[0013] Preferably, an axially extending second clamping arm is fixed on both sides of the distal end of the secondary locking piece, a first clamping block is protruding from the side walls of both sides of the socket, and a notch matching the first clamping block is concavely provided on the outer surface of the second clamping arm, so that when the plug housing and the socket housing are in the secondary locking state, the second clamping arm is clamped in the socket.

[0014] A high-voltage connector includes the secondary locking mechanism described above, at least one pair of matching power male terminals and power female terminals, and a pair of matching signal male terminals and signal female terminals. The power female terminals and signal male terminals are respectively fixed in the plug housing, and the power male terminals and signal female terminals are respectively fixed in the socket housing, and the spacing between the pair of power male terminals and power female terminals is smaller than the spacing between the pair of signal male terminals and signal female terminals.

[0015] The beneficial effects of the present invention are mainly reflected in: A primary locking piece with elastic deformation at both ends is provided to form a primary locking mechanism with a set of blocks to lock the plug housing and the socket housing; a secondary locking piece that can move axially is provided to secondarily lock the plug housing and the socket housing, and the length of the first clamping arm at the distal end of the secondary locking piece is adapted to the primary locking piece, so that in the secondary locking state, the secondary locking piece is simultaneously located at the bottom of the first pressing part and the second pressing part to lock the plug housing and the socket housing while tightening the primary locking piece, and the locking effect of the primary locking mechanism is ensured by locking the primary locking piece, thereby ensuring the stability and reliability of the plugging between the socket housing and the plug housing in the use state, and ensuring safe use; The first stopper and the limit clip are fixedly connected so that the limit clip guides the insertion of the primary locking piece and ensures that the secondary locking piece is located at the bottom of the primary locking piece after being plugged into the first stopper to press against the primary locking piece to form a locking effect; The first stopper and the second stopper form a first gap and a second gap between the end surface of the socket housing to form a height difference. On the one hand, they can be respectively engaged with the inner end and the outer end of the clamping arm. On the other hand, by pressing the first pressing part and the second pressing part, step-by-step unlocking is achieved, realizing step-by-step separation between the power terminal and the signal terminal, thereby avoiding hot plugging and unplugging and ensuring safe use. The first clamping arm is composed of two elastic supporting arms, which are clamped with the limit clamping strip by opening and closing left and right, rather than by buckling up and down, to ensure the integrity of the clamping mechanism of the first clamping arm during movement. At the same time, such an opening and closing structure can cooperate with the fixed block to form an unlocking structure that is easy to open, thereby improving the insertion and removal efficiency of the secondary locking piece, thereby ensuring the service life of the secondary locking piece and forming an effective and reliable clamping effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The technical solution of the present invention will be further described below with reference to the accompanying drawings: Figure 1 : Schematic diagram of a first embodiment of a secondary locking mechanism; Figure 2 : A cross-sectional view of a first embodiment of a secondary locking mechanism; Figure 3 : Schematic diagram of the plug housing; Figure 4 : Schematic diagram of the plug housing from another angle; Figure 5 : Schematic diagram of the secondary locking piece; Figure 6 : A cross-sectional view of the first embodiment of the secondary locking mechanism during the first stage of the primary locking and plugging process; Figure 7: A cross-sectional view of the first embodiment of the secondary locking mechanism during the second stage of the primary locking and plugging process; Figure 8 : A cross-sectional view of the first embodiment of the secondary locking mechanism during the secondary locking and plugging process; Figure 9 : A schematic diagram of a second embodiment of the secondary locking mechanism; Figure 10 : Schematic diagram of the first stage of the high-voltage connector locking and plugging process; Figure 11 : Schematic diagram of the second stage of the high-voltage connector in the single-locking plugging process. DETAILED DESCRIPTION

[0017] The present invention will be described in detail below with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0018] In the description of the scheme, it should be noted that the terms "center", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Moreover, in the description of the scheme, with the operator as a reference, the direction close to the operator is the proximal end, and the direction away from the operator is the distal end.

[0019] like Figures 1 to 11As shown, the present invention discloses a secondary locking mechanism, comprising a plug housing 1 and a socket housing 2 that are pluggable and connected to each other, a primary locking piece 101 is mounted on one end face of the plug housing 1, and a group of blocks are arranged on the same end face of the socket housing 2, the distal end of the primary locking piece 101 is engaged with a group of the blocks to form a primary locking mechanism for locking the plug housing 1 and the socket housing 2 in the plugged state, the primary locking piece 101 extends straight and its middle part is fixed to the plug housing 1, the distal end and proximal end of the primary locking piece 101 form a first pressing part 102 and a second pressing part 103 that can do a seesaw action relative to the middle part, the primary locking mechanism completes step-by-step unlocking by alternately pressing the first pressing part 102 and the second pressing part 103; the primary locking piece 101 and the end of the plug housing 1 are engaged with the block A socket 105 is formed between the surfaces, and a secondary locking piece 3 is movably inserted into the socket 105. An axially extending limit card strip 201 is provided on the end surface of the socket housing 2, and an axially extending first clamping arm 301 is provided at the distal end of the secondary locking piece 3. The distal end of the first clamping arm 301 has a slot 302 that matches the limit card strip 201. The secondary locking piece 3 drives the slot 302 to engage with the limit card strip 201 through axial movement to form a secondary locking mechanism for secondary locking the plug housing 1 and the socket housing 2 in the plugged state. When the plug housing 1 and the socket housing 2 are in the secondary locking state, the first clamping arm 301 is simultaneously located at the bottom of the first pressing portion 102 and the second pressing portion 103 to tighten the primary locking piece 101 to lock the primary locking mechanism.

[0020] This solution provides a primary locking piece 101 whose two ends can be elastically deformed up and down to form a primary locking mechanism with a group of blocks to lock the insertion between the plug housing 1 and the socket housing 2; a secondary locking piece 3 that can move axially is provided to secondarily lock the insertion between the plug housing 1 and the socket housing 2, and the length of the first clamping arm 301 at the far end of the secondary locking piece 3 is adapted to the primary locking piece 101, so that in the secondary locking state, the secondary locking piece 3 is simultaneously located at the bottom of the first pressing portion 102 and the second pressing portion 103 to lock the plug housing 1 and the socket housing 2 while tightening the primary locking piece 101. The locking effect of the primary locking mechanism is ensured by locking the primary locking piece 101, thereby ensuring the stability and reliability of the insertion between the plug housing 1 and the socket housing 2 in the use state, and ensuring safe use.

[0021] The set of stops on the socket housing 2 has two feasible embodiments. Figures 1-8The figure shows a first embodiment of a group of the stops. In the first embodiment, the group of the stops includes a first stop 202 and a second stop 203. The first stop 202 and the second stop 203 have a distance difference in the axial direction (the "axial direction" here is the axial direction of the socket housing 2), and the first stop 202 is closer to the proximal end of the socket housing 2. The front end of the first pressing portion 102 is relatively provided with two clamping arms 109, and a bayonet that can be engaged with the first stop 202 is formed between the inner ends 110 of the clamping arms 109; the two second stops 203 are respectively arranged on both sides of the first stop 202, and the outer ends 111 of the clamping arms 109 can be engaged with the second stop 203.

[0022] like Figure 9 The figure shows a second embodiment of a set of stoppers. The difference between the second embodiment and the first embodiment lies in the different front-to-rear positions of the first stopper 202 and the second stopper 203 in the axial direction. Specifically, in the second embodiment, the set of stoppers includes a first stopper 202 and a second stopper 203. The first stopper 202 and the second stopper 203 are spaced apart in the axial direction, and the second stopper 203 is closer to the proximal end of the socket housing 2. The front end of the first pressing portion 102 is provided with two clamping arms 109, the inner ends 110 of the clamping arms 109 being capable of engaging with the first stopper 202. Two second stoppers 203 are provided on either side of the first stopper 202, and the outer ends 111 of the clamping arms 109 are capable of engaging with the second stopper 203.

[0023] The proximal bottom surface of the first stopper 202 is formed with a first driving inclined surface 2021 that can drive the inner end 110 downward, and the proximal top surface of the second stopper 203 is formed with a second driving inclined surface 2031 that can drive the outer end 111 upward. A first gap 100 is formed between the bottom surface of the first stopper 202 and the end surface of the socket housing 2. The height of the first gap 100 is greater than the thickness of the inner end 110, so that the engagement between the inner end 110 and the first stopper 202 can be released by pressing down on the first pressing portion 102. A second gap 200 is formed between the bottom surface of the inner end 110 and the end surface of the socket housing 2. The height of the second stopper 203 is greater than the second gap 200, so that the engagement between the outer end 111 and the second stopper 203 can be released by pressing down on the second pressing portion 103.

[0024] The first pressing portion 102 and the second pressing portion 103 themselves have the elasticity to elastically deform up and down, so that the primary locking plate 101 is essentially a seesaw structure that can pivot relative to its middle portion. The clamping arm 109 is arranged at the front end of the primary locking plate 101, so that the clamping arm 109 follows the synchronous pivot of the primary locking plate 101 to produce an upward or downward movement.

[0025] Specifically, the working principle of the one-time locking mechanism is as follows (herein, the first embodiment of a set of baffles is used as an example for explanation): Figure 6 and Figure 7 As shown, the single-stage locking and plugging process of the plug housing 1 and the socket housing 2 includes two stages. In the first stage of the single-stage locking and plugging process, the first driving bevel 2021 drives the inner end 110 downward to pass through the first gap 100. In the second stage of the single-stage locking and plugging process, the second driving bevel 2031 drives the outer end 111 upward to pass over the second stop 203 to form a locking connection. At this time, the plug housing 1 and the socket housing 2 are fully plugged in and a single lock is formed. Due to the provision of the first gap 100, the first and second stages can be smoothly connected, allowing the plug housing 1 to be fully plugged into the socket housing 2 through axial movement in a single operation. To improve the smoothness of movement, the distal top surface of the inner end 110 is an inclined surface with a matching inclination with the first driving bevel 2021, and the distal bottom surface of the outer end 111 is an inclined surface with a matching inclination with the second driving bevel 2031.

[0026] The separation process of the plug housing 1 and the socket housing 2 in the primary locked state also includes two stages, namely, the reverse axial movement of the primary locked insertion process. In the first stage of the primary locked separation process, pressing the second pressing portion 103 drives the outer end 111 to move upward and tilt, thereby separating the outer end 111 from the second stop 203, completing the unlocking between the outer end 111 and the second stop 203. Due to the provision of the second gap 200, when the inner end 110 does not move downward, it will be higher than the first gap 100, causing the inner end 110 to abut against the first stop 202 and unable to retreat from the first gap 100. As a result, the unplugging and separation process of the plug housing 1 and the socket housing 2 cannot be completed in one go. Therefore, in the second stage of a locking and separation process, pressing the first pressing portion 102 drives the inner end 110 to move downward, thereby separating the inner end 110 from the first stopper 202 and passing through the first gap 100, completing the unlocking between the inner end 110 and the first stopper 202. At this time, the plug housing 1 further moves axially to complete the separation from the socket housing 2.

[0027] In the second embodiment of the set of blocks, due to the change of the axial position of the first block 202 and the second block 203, the first stage of the insertion process is the clamping between the outer end 111 and the second block 203, and the second stage of the insertion process is the clamping between the inner end 110 and the first block 202; in the first stage of the separation process, the first pressing part 102 needs to be pressed first to complete the separation unlocking between the inner end 110 and the first block 202, and then the second pressing part 103 needs to be pressed to complete the separation unlocking between the outer end 111 and the second block 203, and the principle will not be repeated here.

[0028] As shown in Figure 8 After the plug shell 1 and the socket shell 2 are once locked and inserted, the secondary locking plate 3 is axially moved until the secondary locking plate 3 is completely inserted into the insertion slot 105, the insertion slot 302 is clamped with the limiting clamping strip 201, and at this time the secondary locking between the plug shell 1 and the socket shell 2 is completed. When the plug shell 1 needs to be pulled out, the secondary locking plate 3 is pulled out first, and then the first pressing part 102 or the second pressing part 103 is pressed in reverse to achieve step-by-step unlocking. In order to facilitate the user to operate, the outer surface of the secondary locking plate 3, the first pressing part 102 or the second pressing part 103 is marked with numbers in the order of pulling out, so as to facilitate the user to unlock in order.

[0029] Preferably, the proximal end of the first block 202 is fixedly connected with the distal end of the limiting clamping strip 201, which makes the limiting clamping strip 201 guide the insertion of the primary locking plate 101, and ensures that the secondary locking plate 3 is located at the bottom of the primary locking plate 101 after being inserted to tightly lock the primary locking plate 101. Further, the first block 202 is preferably located at the middle line position of the end face of the socket shell 2, the two second blocks 203 are symmetrically arranged relative to the first block 202, and the limiting clamping strip 201 is also preferably located at the middle line position of the end face of the socket shell 2 to maximize the locking effect of the primary locking plate 101 and the secondary locking plate 3.

[0030] As shown in Figure 3 , Figure 5As shown, the first engaging arm 301 is composed of two symmetrically spaced arms 3011, with the slot 302 formed between the two arms 3011. The proximal end of the position-limiting clip 201 has a head 2011 that is wider than its extended portion. The two arms 3011 are elastic and can move relative to each other, forming an openable and closable opening 3021 to allow the head 2011 to engage with the slot 302. This structure allows the first engaging arm 301 to engage with the position-limiting clip 201 by leveraging its own elasticity to open and close left and right, rather than the traditional snap-on engagement method of moving up and down. This type of engagement ensures the integrity of the first engaging arm 301 and the slot 302 during movement, thereby ensuring the service life of the secondary locking piece and creating an effective and reliable engagement. A reinforcing rib 306 is further provided at the front end connection between the first clamping arm 301 and the secondary locking plate 3 to strengthen the connection between the two, and the thickness of the reinforcing rib 306 is greater than that of the first clamping arm 302 to form a more effective tightening effect on the primary locking plate 101.

[0031] Furthermore, the inner wall of the support arm 3011 is recessed with a limiting recess 3013 that matches the head 2011, and the head 2011 is clamped between the two limiting recesses 3013. The proximal sides of the head 2011, the sides of the opening 3021, and the sides of the limiting recess 3013 are all inclined surfaces with matching inclinations to facilitate the insertion and removal of the limiting strip 201.

[0032] The inner walls of the two arms 3011 are symmetrically provided with protrusions 3012. A retaining groove 303 is formed between the proximal ends of the protrusions 3012 and the proximal ends of the arms 3011. An axially extending fixing block 106 is fixedly provided on the end face of the plug housing 1. When the plug housing 1 and the receptacle housing 2 are in the secondary locking state, the fixing block 106 is located within the retaining groove 303. The distal ends of the fixing block 106 and the distal ends of the retaining groove 303 are inclined surfaces with a consistent slope. Since the slot 302 is opened by the arms 3011 by opening and closing the two arms 3011, the provision of the fixing block 106 can assist in propping up the protrusions 3012 when the secondary locking plate 3 is removed, forming an unlocking structure that facilitates opening, thereby achieving the purpose of opening the slot 302, allowing the slot 302 to quickly separate from the retaining strip 201, and improving the insertion and removal efficiency of the secondary locking plate 3.

[0033] Furthermore, axially extending second clamping arms 304 are fixed to both sides of the distal end of the secondary locking plate 3. First clamping blocks 107 are protruding from the sidewalls of the socket 105. Notches 3041 matching the first clamping blocks 107 are recessed on the outer surfaces of the second clamping arms 304. This allows the second clamping arms 304 to be clamped within the socket 105 when the plug housing 1 and the socket housing 2 are in the secondary locking state. The provision of the second clamping arms 304 strengthens the connection and fixation between the secondary locking plate 3 and the socket 105, ensuring the stability and reliability of the locking of the secondary locking plate 3.

[0034] The proximal end of the end surface of the plug housing 1 forms a retaining wall that directly faces the proximal end of the socket 105 to prevent the secondary locking plate 3 from falling, so that the secondary locking plate 3 is pre-installed in the plug housing 1 when not inserted. Furthermore, a first limit block 305 can be provided on the top of the second clamping arm 304 or the first clamping arm 301. The second limit block 104 is provided on the inner wall of the top surface of the socket 105, which can be engaged with the first limit block 305 to limit the rearward movement limit of the secondary locking plate 3 and prevent it from falling.

[0035] Furthermore, the present invention also discloses a high-voltage connector, comprising the secondary locking mechanism as described above, at least one pair of matching power male terminals 4 and power female terminals 5, and a pair of matching signal male terminals 6 and signal female terminals 7, wherein the power female terminals 5 and signal male terminals 6 are respectively fixed in the plug housing 1, and the power male terminals 4 and signal female terminals 7 are respectively fixed in the socket housing 2, and the spacing between the pair of power male terminals 4 and power female terminals 5 is smaller than the spacing between the pair of signal male terminals 6 and signal female terminals 7. Such a structural arrangement cooperates with the secondary locking mechanism to achieve step-by-step separation between the power terminals and the signal terminals. Specifically, as Figure 10 and Figure 11 As shown, such a structure can ensure that a pair of power male terminals 4 and power female terminals 5 are connected first, and a pair of signal male terminals 6 and signal female terminals 7 are connected later; a pair of signal male terminals 6 and signal female terminals 7 are disconnected first; and a pair of power male terminals 4 and power female terminals 5 are disconnected later, avoiding hot plugging and unplugging to ensure safe use.

[0036] In addition, the high-voltage connector also includes necessary structures such as a waterproof ring provided at the distal ends of the socket housing 2 and the plug housing 1 . This is prior art and will not be described in detail here.

[0037] It should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation method can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0038] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A secondary locking mechanism comprising a plug housing (1) and a socket housing (2) that are pluggably connected to each other, characterized in that: A one-side locking plate (101) is mounted on the end surface of one side of the plug housing (1), and a group of blocks are provided on the end surface of the same side of the socket housing (2). The distal end of the one-side locking plate (101) is engaged with the group of blocks to form a one-side locking mechanism for locking the plug housing (1) and the socket housing (2) in an engaged state. The one-side locking plate (101) extends straight and its middle portion is fixed to the plug housing (1). The distal end and the proximal end of the one-side locking plate (101) form a first pressing portion (102) and a second pressing portion (103) that can perform a seesaw action relative to the middle portion. The one-side locking mechanism completes step-by-step unlocking by alternately pressing the first pressing portion (102) and the second pressing portion (103). A socket (105) is formed between the primary locking piece (101) and the end surface of the plug housing (1), and a secondary locking piece (3) is movably inserted into the socket (105). An axially extending limit card strip (201) is provided on the end surface of the socket housing (2). An axially extending first clamping arm (301) is provided at the distal end of the secondary locking piece (3), and a slot (302) matching the limit card strip (201) is provided at the distal end of the first clamping arm (301). The plate (3) drives the slot (302) to engage with the limiting clamping strip (201) through axial movement to form a secondary locking mechanism for secondary locking of the plug housing (1) and the socket housing (2) in the plugged state. When the plug housing (1) and the socket housing (2) are in the secondary locking state, the first clamping arm (301) is simultaneously located at the bottom of the first pressing portion (102) and the second pressing portion (103) to press the primary locking plate (101) to lock the primary locking mechanism.

2. A secondary locking mechanism according to claim 1, characterized in that: A group of the blocks includes a first block (202) and a second block (203), wherein the first block (202) and the second block (203) have a distance difference in the axial direction, and the first block (202) is closer to the proximal end of the socket housing (2); the front end of the primary locking plate (101) is relatively provided with two clamping arms (109), and a bayonet that can be engaged with the first block (202) is formed between the inner ends (110) of the clamping arms (109); the two second blocks (203) are respectively arranged on both sides of the first block (202), and the outer ends (111) of the clamping arms (109) can be engaged with the second block (203).

3. The secondary locking mechanism according to claim 1, characterized in that: A group of the blocks includes a first block (202) and a second block (203), wherein the first block (202) and the second block (203) have a distance difference in the axial direction, and the second block (203) is closer to the proximal end of the socket housing (2); the front end of the primary locking plate (101) is relatively provided with two clamping arms (109), and the inner ends (110) of the clamping arms (109) can be clamped with the first block (202); the two second blocks (203) are respectively provided on both sides of the first block (202), and the outer ends (111) of the clamping arms (109) can be clamped with the second block (203).

4. A secondary locking mechanism according to claim 2 or 3, characterized in that: The proximal bottom surface of the first stopper (202) is formed with a first driving inclined surface (2021) capable of driving the inner end (110) to move downward, and the proximal top surface of the second stopper (203) is formed with a second driving inclined surface (2031) capable of driving the outer end (111) to move upward; a first gap (100) is formed between the bottom surface of the first stopper (202) and the end surface of the socket housing (2), and the height of the first gap (100) is greater than the thickness of the inner end (110), so as to The first pressing portion (102) can be pressed downward to unlock the engagement between the inner end (110) and the first stopper (202); a second gap (200) is formed between the bottom surface of the inner end (110) and the end surface of the socket housing (2), and the height of the second stopper (203) is greater than the second gap (200), so that the second pressing portion (103) can be pressed downward to unlock the engagement between the outer end (111) and the second stopper (203).

5. A secondary locking mechanism according to claim 4, characterized in that: The proximal end of the first stopper (202) is fixedly connected to the distal end of the limiting clamping strip (201).

6. A secondary locking mechanism according to claim 5, characterized in that: The first clamping arm (301) is composed of two support arms (3011) that are symmetrically arranged at intervals, and the slot (302) is formed between the two support arms (3011). The proximal end of the limiting clamping strip (201) has a head (2011) with a width greater than that of its extension portion, and the two support arms (3011) have elasticity that can move relative to each other to form an openable and closable opening (3021) to allow the head (2011) to be clamped into the slot (302).

7. A secondary locking mechanism according to claim 6, characterized in that: The inner wall of the support arm (3011) is provided with a limiting recess (3013) matching the head (2011), and the head (2011) is clamped between the two limiting recesses (3013). Both sides of the proximal end of the head (2011), both sides of the opening (3021), and both sides of the limiting recesses (3013) are inclined surfaces with matching inclinations.

8. The secondary locking mechanism according to claim 7, characterized in that: Protrusions (3012) are symmetrically provided on the inner walls of the two support arms (3011), and a limiting groove (303) is formed between the proximal end of the protrusion (3012) and the proximal end of the support arm (3011). An axially extending fixing block (106) is fixedly provided on the end face of the plug housing (1). When the plug housing (1) and the socket housing (2) are in a secondary locking state, the fixing block (106) is located in the limiting groove (303), and both sides of the distal end of the fixing block (106) and the distal end of the limiting groove (303) are inclined surfaces with the same slope.

9. The secondary locking mechanism according to claim 8, characterized in that: Axially extending second clamping arms (304) are fixed to both sides of the distal end of the secondary locking piece (3), first clamping blocks (107) are convexly provided on the side walls of both sides of the socket (105), and recesses (3041) matching the first clamping blocks (107) are concavely provided on the outer surface of the second clamping arm (304), so that when the plug housing (1) and the socket housing (2) are in the secondary locking state, the second clamping arm (304) is clamped in the socket (105).

10. High voltage connector, characterized by: The invention comprises a secondary locking mechanism as described in any one of claims 1 to 9, at least one pair of matching power male terminals (4) and power female terminals (5), and a pair of matching signal male terminals (6) and signal female terminals (7), wherein the power female terminals (5) and signal male terminals (6) are respectively fixed in the plug housing (1), and the power male terminals (4) and signal female terminals (7) are respectively fixed in the socket housing (2), and the spacing between the pair of power male terminals (4) and power female terminals (5) is smaller than the spacing between the pair of signal male terminals (6) and signal female terminals (7).

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