Releasing sub

Abstract

The utility model discloses a releasing sub, which belongs to the technical field of petroleum and natural gas and comprises an upper sub, a lower sub, a locking piece, a sliding sleeve and a plugging piece, and an upper cavity extending along the axial direction of the upper sub is arranged in the upper sub in a penetrating manner; the lower joint sleeves the lower end of the upper joint and is provided with a lower cavity extending in the axial direction of the lower joint in a penetrating manner; the locking piece can lock or unlock the upper joint and the lower joint; the sliding sleeve is coaxially and movably arranged in the upper cavity, the outer side wall of the sliding sleeve is in sealed connection with the cavity wall of the upper cavity, an inner cavity extending in the axial direction of the sliding sleeve is formed in the sliding sleeve in a penetrating mode, the upper cavity, the inner cavity and the lower cavity are sequentially communicated, when the sliding sleeve is located at the first position, the locking piece locks the lower connector and the upper connector, and when the sliding sleeve is located at the second position, the locking piece unlocks the lower connector and the upper connector; the blocking piece is arranged to be clamped with the sliding sleeve in a sealed mode to block the inner cavity after being thrown into the inner cavity and can drive the sliding sleeve to move from the first position to the second position. During releasing, the upper cavity and the lower cavity are separated, and pressure of the upper cavity and pressure of the lower cavity are not communicated after releasing.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas technology, and in particular to a hand-release connector. Background Technology

[0002] Safety release connectors are generally used on the upper part of tools such as packers. In the event of an accident such as the tubing getting stuck, a ball or rod can be thrown to pressurize and shear the shear pin, open the sliding sleeve, and lift the tubing to release the tool. Simply put, releasing the tool means "dropping" it into the wellbore. "Dropping" means that the tool below is not connected to the wellhead and exists independently in the well.

[0003] When the conventional safety release connector is disconnected, the pressure of the entire formation is connected with the pressure in the tubing string. Formation pressure and formation water will back out to the wellhead through the tubing. Formation water will cause pollution to the surface, so well control operations are required to deliver kill fluid into the tubing string. However, kill fluid can easily pollute the formation reservoir.

[0004] Therefore, there is an urgent need for a drop-off connector to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a release connector to solve the technical problem in the prior art where the pressure in the formation is connected to the pressure in the tubing after release, and the killing fluid can easily contaminate the formation reservoir when killing operations are required.

[0006] Based on the above concept, the technical solution adopted by this utility model is as follows:

[0007] Drop-off connectors, including:

[0008] The upper connector has an upper cavity extending along its own axial direction.

[0009] The lower connector is sleeved on the lower end of the upper connector, and a lower cavity extending along its own axial direction is provided through the lower connector.

[0010] A locking element is provided to lock or unlock the upper connector and the lower connector;

[0011] A sliding sleeve is coaxially and movably disposed in the upper cavity. The outer wall of the sliding sleeve is sealed to the cavity wall of the upper cavity. An inner cavity extending along its own axial direction is disposed through the sliding sleeve. The upper cavity, the inner cavity, and the lower cavity are sequentially connected. The sliding sleeve has a first position and a second position. In the first position, the locking member locks the lower connector and the upper connector. In the second position, the locking member unlocks the lower connector and the upper connector, and the lower connector and the upper connector can be separated.

[0012] The sealing element is configured to engage with the sliding sleeve after being inserted into the inner cavity to seal the inner cavity, and the sealing element can drive the sliding sleeve to move from the first position to the second position.

[0013] Furthermore, the inner wall of the lower connector is provided with a first clearance groove, the outer wall of the sliding sleeve is provided with a second clearance groove, and the locking member is always provided through the side wall of the upper connector.

[0014] In the first position, the sliding sleeve presses the locking member against the first clearance groove;

[0015] In the second position, the second clearance groove is disposed opposite to the locking member, and the locking member disengages from the first clearance groove and partially extends into the second clearance groove.

[0016] Furthermore, the locking member is provided with a first inclined surface, and the first clearance groove is provided with a second inclined surface. When the sliding sleeve is in the first position, the first inclined surface abuts against the second inclined surface.

[0017] When the sliding sleeve is in the second position, the upper connector moves relative to the lower connector, and the second inclined surface can guide the locking member to disengage from the first clearance groove.

[0018] Furthermore, a first slot is provided on the outer side of the sealing member, a first retaining spring is provided in the first slot, and a second slot is provided on the inner wall of the sliding sleeve. The first retaining spring can move with the sealing member to be opposite to the second slot and pop out to a free state. In the free state, the first retaining spring is engaged with both the first slot and the second slot.

[0019] Furthermore, a sealing element is also provided on the outer surface of the sealing element.

[0020] Furthermore, it also includes a shearable component that passes radially through the side wall of the upper connector and the side wall of the sliding sleeve. When the sliding sleeve switches from the first position to the second position, it can shear the shearable component.

[0021] Furthermore, it also includes a second position locking mechanism, which is disposed in the upper cavity and can lock the sliding sleeve in the second position.

[0022] Furthermore, the second position locking mechanism includes:

[0023] A third slot is provided on the upper connector;

[0024] The second retaining spring is snapped onto the outside of the sliding sleeve. In the first position, the second retaining spring is retracted and offset from the third retaining groove. In the second position, the second retaining spring is ejected and snapped onto both the sliding sleeve and the third retaining groove.

[0025] Furthermore, a retaining ring is provided at the lower end of the upper connector, and a positioning step is provided on the retaining ring. In the second position, the sliding sleeve abuts against the positioning step.

[0026] Furthermore, one of the upper connector and the lower connector is provided with a plugging protrusion, and the other is provided with a plugging groove that engages with the plugging protrusion.

[0027] The beneficial effects of this utility model are:

[0028] The release connector proposed in this utility model uses the outer wall of the sliding sleeve to seal against the wall of the upper cavity. When the unlocking component is inserted into the inner cavity, it can seal against the sliding sleeve to block the inner cavity, and move the sliding sleeve to the second position to unlock the upper and lower connectors. This ensures that when the connector is released, the upper connector is sealed to the sliding sleeve, and the sliding sleeve is also sealed to the sealing component. The sealing component blocks the inner cavity, thus completely separating the upper and lower cavities. This prevents pressure from flowing between the upper and lower cavities after the connector is released, ensuring that formation pressure and formation water cannot flow back to the wellhead through the tubing during tubing connection, preventing formation water from polluting the surface. At the same time, well control operations are no longer required, effectively preventing well control fluid from polluting the formation reservoir. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0030] Figure 1 This is a half-sectional view of the drop-out connector provided in this embodiment of the utility model when the sealing component is not inserted;

[0031] Figure 2 yes Figure 1 Cross-sectional view at point AA.

[0032] Figure 3 yes Figure 1 Cross-sectional view at point BB.

[0033] Figure 4 This is a half-sectional view of the sliding sleeve in the first position and the upper and lower connectors not separated when the release connector is inserted into the sealing component according to the embodiment of this utility model.

[0034] Figure 5 This is a half-sectional view of the sliding sleeve in the second position and the connector and the lower connector not separated when the release connector is inserted into the sealing component according to the embodiment of this utility model.

[0035] Figure 6 This is a half-sectional view of the release connector locking member provided in this embodiment of the present invention when it is unlocked and the upper connector and the lower connector have just started to separate.

[0036] Figure 7 yes Figure 6 A magnified view of a section at point C.

[0037] Figure 8 yes Figure 6 Enlarged view of a section at point D

[0038] Figure 9 This is a half-sectional view of the drop-out connector provided in this embodiment of the utility model, showing the upper and lower connectors separated.

[0039] Figure 10 This is a half-sectional view of the sealing component provided in this embodiment of the utility model.

[0040] In the picture:

[0041] 1. Upper connector; 11. Upper cavity; 12. Locking hole; 13. Third slot; 2. Lower connector; 21. Lower cavity; 22. First clearance groove; 221. Second inclined surface; 3. Locking element; 31. First inclined surface; 4. Sliding sleeve; 41. Inner cavity; 42. Second clearance groove; 43. Second slot; 44. Second snap ring; 5. Sealing element; 51. First slot; 52. First snap ring; 53. Sealing element; 6. Shearable element; 7. Retaining ring; 8. Insertion protrusion. Detailed Implementation

[0042] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0043] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for 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, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Specifically, the terms "first position" and "second position" refer to two different positions.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections 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.

[0045] This embodiment provides a drop-off connector that can be applied in the field of oil and gas technology to prevent formation water from polluting the surface and to prevent the well-killing fluid from easily polluting the formation reservoir during well-killing operations.

[0046] like Figures 1 to 6 As shown, the release connector includes an upper connector 1, a lower connector 2, a locking element 3, a sliding sleeve 4, and a sealing element 5. An upper cavity 11 extending axially through the upper connector 1 is provided. The lower connector 2 is fitted onto the lower end of the upper connector 1, and a lower cavity 21 extending axially through the lower connector 2 is provided.

[0047] The locking element 3 can lock or unlock the upper connector 1 and the lower connector 2.

[0048] The sliding sleeve 4 is coaxially and movably disposed in the upper cavity 11. The outer wall of the sliding sleeve 4 is in sealing contact with the cavity wall of the upper cavity 11. An inner cavity 41 extending along its own axial direction is disposed through the sliding sleeve 4. The upper cavity 11, the inner cavity 41, and the lower cavity 21 are sequentially connected. The sliding sleeve 4 has a first position and a second position. In the first position, the locking member 3 locks the lower connector 2 and the upper connector 1. In the second position, the locking member 3 unlocks the lower connector 2 and the upper connector 1, and the lower connector 2 and the upper connector 1 are separated.

[0049] Specifically, such as Figure 1 and Figure 4 As shown, the sliding sleeve 4 is in the first position; as Figure 5 and Figure 6 As shown, the sliding sleeve 4 is in the second position.

[0050] The sealing element 5 is configured to engage with the sliding sleeve 4 after being inserted into the inner cavity 41 to seal the inner cavity 41. The sealing element 5 can drive the sliding sleeve 4 to move from the first position to the second position.

[0051] Specifically, such as Figure 1 As shown, in the initial state, the sliding sleeve 4 is in the first position. At this time, the sealing element 5 is not inserted into the inner cavity 41. The upper cavity 11, the inner cavity 41, and the lower cavity 21 are connected in sequence, allowing liquid to flow. The locking element 3 locks the upper connector 1 and the lower connector 2 together. Figure 4 As shown, when it is necessary to release the device, the sealing element 5 is inserted into the inner cavity 41. After the sealing element 5 is sealed and engaged with the sliding sleeve 4, as shown... Figures 5-8 As shown, pressure is applied to the upper cavity 11, causing the sealing element 5 to move along with the sliding sleeve 4. Figure 5 In the second position shown, at this time, the sliding sleeve 4 is sealed to the upper connector 1, and the sealing element 5 is also sealed to the sliding sleeve 4. The sealing element 5 seals the inner cavity 41, thereby completely separating the upper cavity 11 and the lower cavity 21, so that the upper connector 1 and the lower connector 2 are in a closed position. Figure 9 After the unlocked and separated state is shown, the pressure of the upper chamber 11 and the lower chamber 21 is not interconnected, ensuring that the formation pressure and formation water cannot be backflowed to the wellhead through the tubing after the release operation is completed, preventing formation water from polluting the surface, and also eliminating the need for well control operations.

[0052] Further, see Figure 6 and Figure 7 The inner wall of the lower connector 2 is provided with a first clearance groove 22, and the outer wall of the sliding sleeve 4 is provided with a second clearance groove 42. The locking member 3 always passes through the side wall of the upper connector 1. Specifically, as shown in the figure... Figure 7 As shown, the side wall of the upper connector 1 is provided with a locking hole 12, and the locking member 3 always passes through the locking hole 12.

[0053] like Figure 1 and Figure 4 As shown, in the first position, the sliding sleeve 4 presses the locking member 3 against the first clearance groove 22.

[0054] like Figure 6 As shown, in the second position, the second clearance groove 42 is disposed opposite to the locking member 3, and the locking member 3 disengages from the first clearance groove 22 and partially extends into the second clearance groove 42.

[0055] Further, see Figure 6 and Figure 7 The locking element 3 is provided with a first inclined surface 31, and the first clearance groove 22 is provided with a second inclined surface 221. For example... Figure 4 As shown, when the sliding sleeve 4 is in the first position, the sliding sleeve 4 presses the locking member 3 against the first relief groove 22, and the first inclined surface 31 abuts against the second inclined surface 221.

[0056] Specifically, with Figure 7 Taking the orientation shown as an example, the first inclined surface 31 is located on the upper side of the locking member 3; the second inclined surface 221 is located on the upper side of the first clearance groove 22.

[0057] See Figure 5 When the sliding sleeve 4 is switched to the second position, the part of the locking member 3 that protrudes relative to the locking hole 12 is located within the first clearance groove 22; see Figure 6 and Figure 7 When the upper connector 1 moves upward relative to the lower connector 2, the upper connector 1 drives the locking member 3 to move upward. The first inclined surface 31 moves upward along the second inclined surface 221 and the locking member 3 eventually disengages from the first relief groove 22. After the locking member 3 disengages from the first relief groove 22, the part of the locking member 3 that protrudes relative to the locking hole 12 is located in the second relief groove 42.

[0058] Specifically, such as Figure 1 and Figure 4 As shown, when the sliding sleeve 4 is in the first position, the sliding sleeve 4 presses the locking member 3 against the first relief groove 22, and the first inclined surface 31 abuts against the second inclined surface 221, so that the locking member 3 locks the upper connector 1 and the lower connector 2. Figure 5 As shown, the sliding sleeve 4 moves from the first position to the second position. The second clearance groove 42 on the sliding sleeve 4 is positioned opposite to the locking member 3, and the sliding sleeve 4 no longer presses against the locking member 3. At this time, as... Figure 6 As shown, simply lifting the upper connector 1 allows the locking member 3 to disengage from the first clearance groove 22 via the first inclined surface 31 and the second inclined surface 221, and the lower connector 2 loses the obstruction of the locking member 3, thus unlocking the upper connector 1 and the lower connector 2, allowing them to separate.

[0059] Furthermore, along the axial direction of the sliding sleeve 4, the size of the second clearance groove 42 is larger than the size of the locking member 3, so that the locking member 3 can smoothly leave the first clearance groove 22 and partially extend into the second clearance groove 42.

[0060] Furthermore, such as Figure 8 As shown, the outer side of the sealing member 5 is provided with a first slot 51, and the first slot 51 is provided with a first retaining spring 52. The inner wall of the sliding sleeve 4 is provided with a second slot 43. The first retaining spring 52 can move with the sealing member 5 to be opposite to the second slot 43 and pop out to a free state. In the free state, the first retaining spring 52 is engaged with both the first slot and the second slot 43.

[0061] In its free state, the first snap ring 52 engages with both the first and second snap grooves 43, thereby achieving a sealing engagement between the sealing component 5 and the sliding sleeve 4.

[0062] Specifically, when the sealing member 5 is not inserted into the inner cavity 41, the first retaining spring 52 is located in the first retaining groove 51 and is in a free state; when the sealing member 5 is inserted into the inner cavity 41, under the pressure of the inner wall of the inner cavity 41, the first retaining spring 52 will retract into the first retaining groove 51; when the sealing member 5 moves down to the point where the first retaining groove 51 and the second retaining groove 43 are positioned opposite each other, the first retaining spring 52 will pop out to a free state and engage with both the first retaining groove and the second retaining groove 43.

[0063] like Figure 10 As shown, in order to ensure the sealing effect between the sliding sleeve 4 and the sealing member 5, in this embodiment, a sealing member 53 is also provided on the outer surface of the sealing member 5. The sealing member 53 abuts against the inner wall of the inner cavity 41 to ensure the sealing performance of the sealing member 5 in sealing the inner cavity 41.

[0064] Furthermore, a second sealing element is provided between the sliding sleeve 4 and the upper connector 1 to ensure the sealing effect between the sliding sleeve 4 and the upper connector 1.

[0065] Furthermore, such as Figure 1 As shown, in order to ensure that the sliding sleeve 4 can be fixed in the first position in the initial state, the release connector also includes a shearable part 6. The shearable part 6 passes through the side wall of the upper connector 1 and the side wall of the sliding sleeve 4 in a radial direction. When the sliding sleeve 4 switches from the first position to the second position, it can cut the shearable part 6.

[0066] Furthermore, in order to ensure that the liquid does not enter the upper cavity 11 through the gap between the shearable part 6 and the upper connector 1, a sealing element is also provided between the upper connector 1 and the shearable part 6.

[0067] Furthermore, the release connector also includes a second position locking mechanism, which is disposed in the upper cavity 11 and can lock the sliding sleeve 4 in the second position.

[0068] Furthermore, such as Figure 4 As shown, the second position locking mechanism includes a third slot 13 and a second snap ring 44.

[0069] The third slot 13 is provided on the upper connector 1; the second retaining spring 44 is engaged on the outside of the sliding sleeve 4. In the first position, the second retaining spring 44 is retracted and offset from the third slot 13. In the second position, the second retaining spring 44 is ejected and engaged with both the sliding sleeve 4 and the third slot 13.

[0070] Specifically, the outer side of the sliding sleeve 4 is provided with a fourth groove that engages with the second retaining spring 44.

[0071] Specifically, such as Figure 1 and Figure 4 As shown, in the initial state, the sliding sleeve 4 is in the first position, at which time the second retaining ring 44 retracts between the sliding sleeve 4 and the upper connector 1 and is located in the fourth retaining groove. Figure 5As shown, when the sliding sleeve 4 is driven by the sealing member 5 and moves to the second position, the second snap ring 44 is opposite to the third snap groove 13 provided on the upper connector 1. At this time, the second snap ring 44 pops out and engages with both the third snap groove 13 and the fourth snap groove to fix the sliding sleeve 4 in the second position.

[0072] Furthermore, a retaining ring 7 is provided at the lower end of the upper connector 1, and a positioning step is provided on the retaining ring 7. In the second position, the sliding sleeve 4 abuts against the positioning step to further restrict the downward movement of the sliding sleeve 4.

[0073] Furthermore, in order to ensure that the release connector can withstand circumferential torque when it is not needed after installation, one of the upper connector 1 and the lower connector 2 is provided with a plug-in protrusion 8, and the other is provided with a plug-in groove that engages with the plug-in protrusion 8.

[0074] Specifically, see Figures 4 to 7 The release process of the release connector provided in this embodiment is as follows:

[0075] like Figure 4 As shown, the sealing component 5 is inserted, and as the sealing component 5 falls, the sealing component 5 and the sliding sleeve 4 are sealed and engaged.

[0076] like Figure 5 As shown, the control lever (not shown in the figure) then pushes the sealing member 5 down into place. During the process of the control lever pushing the sealing member 5 down, the shearable member 6 is sheared, and the sliding sleeve 4 falls down with the sealing member 5 until the sealing member 5 falls into place. At this time, the sliding sleeve 4 switches from the first position to the second position, and the second snap ring 44 is sealed and fixed with the third snap groove 13 on the upper connector 1. The second clearance groove 42 falls down to be opposite to the locking member 3.

[0077] like Figure 6 As shown, pull the upper connector 1 upward; during the process of pulling the upper connector 1 upward, the locking piece 3 disengages from the first clearance groove 22 and partially enters the second clearance groove 42. At this time, the upper connector 1 and the lower connector 2 are unlocked.

[0078] like Figure 9 As shown, continue pulling up the upper connector 1 until the upper connector 1 and the lower connector 2 are completely disengaged, completing the release operation. At this time, due to the presence of the sealing component 5, the upper cavity 11 is completely sealed, and the upper cavity 11 and the lower cavity 21 are not connected. This ensures that the pressure of the upper cavity 11 and the lower cavity 21 is not interconnected after the release, ensuring that the formation pressure and formation water cannot be backflowed to the wellhead through the tubing when the tubing string is pulled out, thus preventing the formation water from polluting the surface. At the same time, there is no need to perform well control operations, effectively preventing the well control fluid from polluting the formation reservoir.

[0079] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A drop-in joint, characterized in that: include: An upper joint (1), wherein an upper cavity (11) extending along the axial direction of the upper joint (1) is provided through the upper joint (1); A lower joint (2), wherein the lower joint (2) is sleeved on the lower end of the upper joint (1), and a lower cavity (21) extending along the axial direction of the lower joint (2) is provided through the lower joint (2); A locking member (3) capable of locking or unlocking the upper joint (1) and the lower joint (2); A sliding sleeve (4), wherein the sliding sleeve (4) is coaxially and movably arranged in the upper chamber (11), the outer wall of the sliding sleeve (4) is sealedly connected to the chamber wall of the upper chamber (11), the sliding sleeve (4) is provided with an inner chamber (41) extending along its own axial direction, the upper chamber (11), the inner chamber (41) and the lower chamber (21) are sequentially connected, and the sliding sleeve (4) has a first position and a second position. In the first position, the locking member (3) locks the lower joint (2) and the upper joint (1), and in the second position, the locking member (3) unlocks the lower joint (2) and the upper joint (1) and the lower joint (2) and the upper joint (1) can be separated; The blocking member (5) is configured to be inserted into the inner cavity (41) and then be sealingly engaged with the sliding sleeve (4) to block the inner cavity (41). The blocking member (5) can drive the sliding sleeve (4) to move from the first position to the second position.

2. The drop-out connector according to claim 1, characterized in that: The inner wall of the lower joint (2) is provided with a first avoidance groove (22), the outer wall of the sliding sleeve (4) is provided with a second avoidance groove (42), and the locking member (3) is always arranged through the side wall of the upper joint (1); In the first position, the sliding sleeve (4) presses the locking member (3) against the first avoidance groove (22); In the second position, the second avoidance groove (42) is arranged opposite to the locking member (3), and the locking member (3) is separated from the first avoidance groove (22) and partially extends into the second avoidance groove (42).

3. The drop-out connector according to claim 2, characterized in that: The locking member (3) is provided with a first inclined surface (31), the first avoidance groove (22) is provided with a second inclined surface (221), and when the sliding sleeve (4) is in the first position, the first inclined surface (31) abuts against the second inclined surface (221); When the sliding sleeve (4) is in the second position, the upper joint (1) moves relative to the lower joint (2), and the second inclined surface (221) can guide the locking member (3) to disengage from the first avoidance groove (22).

4. The drop-out connector according to claim 1, characterized in that: A first clamping groove (51) is arranged on the outer side of the blocking member (5), a first clamping spring (52) is arranged in the first clamping groove (51), a second clamping groove (43) is arranged on the inner wall of the sliding sleeve (4), the first clamping spring (52) can move with the blocking member (5) to be opposite to the second clamping groove (43) and pop out to a free state, and the first clamping spring (52) is clamped with both the first clamping groove (51) and the second clamping groove (43) in the free state.

5. The drop-out connector according to claim 1, characterized in that: A sealing member (53) is also provided on the outer surface of the blocking member (5).

6. The drop-out connector according to claim 1, characterized in that: It also comprises a shearable piece (6), which passes through the side wall of the upper joint (1) and the side wall of the sliding sleeve (4) in sequence in the radial direction, and when the sliding sleeve (4) switches from the first position to the second position, the shearable piece (6) can be sheared off.

7. The drop-out connector according to claim 1, characterized in that: It also comprises a second position locking mechanism, which is arranged in the upper cavity (11) and can lock the sliding sleeve (4) in the second position.

8. The drop-out connector according to claim 7, characterized in that: The second position locking mechanism comprises: A third card slot (13) is arranged on the upper connector (1); A second retaining spring (44) is disposed on the outer side of the sliding sleeve (4) and is engaged with the sliding sleeve (4). In the first position, the second retaining spring (44) is contracted and is disposed in a staggered manner with the third retaining groove (13). In the second position, the second retaining spring (44) pops out and is engaged with both the sliding sleeve (4) and the third retaining groove (13).

9. The drop-out connector according to claim 7, characterized in that: A retaining ring (7) is also provided at the lower end of the upper joint (1), and a positioning step is also provided on the retaining ring (7). In the second position, the sliding sleeve (4) abuts against the positioning step.

10. The drop-out connector according to any one of claims 1 to 9, characterized in that: One of the upper joint (1) and the lower joint (2) is provided with a plug-in protrusion (8), and the other is provided with a plug-in groove that plugs and cooperates with the plug-in protrusion (8).

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