A sealed connection device

Abstract

The application discloses a sealed connecting device, which comprises a first connecting seat, a second connecting seat, a first connecting pipe and a second connecting pipe. The first connecting pipe is axially movable and is axially elastically supported by an elastic member. When the first connecting seat is butted against the second connecting seat, the elastic member is deformed to store energy, so that the deforming force of the elastic member is greater than or equal to the pressure of fluid acting on the end surface of the connecting pipe, thereby forming an elastic butt joint between the two connecting pipes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of treatment equipment parts, in particular to a sealing connection device of a cryotherapy equipment. BACKGROUND

[0002] The cryotherapy system generally comprises a cryotherapy equipment and a cryotherapy instrument. The existing cryotherapy equipment usually provides cold energy for the cryotherapy instrument by using a medium such as liquid nitrogen. The cryotherapy instrument directly acts on the human body to achieve the treatment of diseases or induce cell apoptosis. A connection device is needed between the cryotherapy instrument and the cryotherapy equipment to transport gaseous medium, liquid medium or form a vacuum pipeline. The plug-in connection of a connector and an interface is usually used to achieve quick plugging and unplugging. For example, the patent document with the announcement number CN215129978U discloses a sealing connection device under high-pressure and low-temperature conditions, which comprises a quick plug connector, a quick plug interface and a positioning block assembly. The positioning block assembly is installed on the quick plug interface. At least one medium hole is arranged on one end of the quick plug connector, and a sealing assembly is arranged in the medium hole. When the quick plug connector is connected with the quick plug interface, one end of the quick plug connector is inserted into the insertion hole and sealed by the sealing assembly, thereby realizing the sealing connection of a single channel or multiple channels. The positioning block assembly is used to maintain the connection state of the channel.

[0003] In the prior art, the interface generally adopts two sealing docking methods. One is to directly dock the male and female heads by using an axial fastening structure to achieve sealing connection. In this way, the docking pressure between the second connecting pipe and the first docking pipe (the docking pressure is used to offset the end face pressure of the second connecting pipe when working) is realized by the slight deformation of the material of each component. This makes the docking force uncontrollable and unpredictable after fastening, which is not conducive to accurately controlling the force, thereby causing the docking force to be too large or too small. Too large will result in high operating strength and easy damage to the material, and too small will easily cause liquid leakage. The other is to set a soft buffer between the second connecting pipe and the first docking pipe. This can overcome the defects of the direct docking to some extent. However, considering that the fluid flowing in the pipe is high-pressure and deep-cold, the damage to the soft buffer cannot be ignored, and the deep cold may also freeze the buffer and the male and female heads, making them difficult to separate, thereby also being unable to dock for a long time and stably.

[0004] In addition, after the connection is completed and liquid nitrogen is introduced as the working medium, the low-temperature liquid nitrogen will cause the connection to withstand a temperature difference change of nearly 200 degrees, which will cause the connection port to shrink due to the temperature difference change. The pressure of the liquid nitrogen and its gasification will also cause the gas pressure in the pipe to increase significantly, which will greatly affect the sealing performance of the pipe interface and test the effectiveness of the docking structure. Of course, after the use of the cryogenic equipment is completed, the liquid nitrogen is stopped and the docking pipeline is disassembled, the pressure and temperature of the pipeline will also decrease and increase significantly in the opposite direction.

[0005] Therefore, for the connecting device of the refrigeration equipment, the thermal expansion and contraction caused by the huge temperature difference, the pressure mutation of the working medium, and the local icing caused by the low temperature of the flowing working medium during operation, the icing will make it difficult for the operator to quickly disassemble the quick plug connector and the quick plug connector, and forcibly pulling out the plug will also easily cause damage to the quick plug connector or the quick plug connector, reducing the service life, which are all problems that the connecting device needs to face. Among them, the sharp change of temperature makes the thermal expansion and contraction phenomenon obvious, which is easy to cause the sealing performance to decrease or the working medium to leak; the instantaneous pressure mutation of the working medium when the refrigeration equipment starts and stops will generate impact force on the pipeline, which will also make the butt sealing effect worse or the working medium to leak; in addition, the conventional sealing gasket will be brittle at low temperature, which will reduce the sealing performance and shorten the service life. SUMMARY

[0006] The purpose of the present application is to design a sealing connecting device for a refrigeration treatment equipment to solve the above technical problems. The single channel or multiple channels are butt jointed, and the first butt joint pipe and the second connecting pipe are connected and self-locked by the locking mechanism to maintain good channel sealing stability, quick and convenient disassembly, and improve the service life.

[0007] To solve the above technical problems, the technical scheme of the present application is:

[0008] A sealing connecting device, comprising a first connecting seat, a second connecting seat, and a first butt joint pipe and a second connecting pipe respectively arranged on the first connecting seat and the second connecting seat, the first butt joint pipe is movably arranged along its length direction, and an elastic member is arranged between the first butt joint pipe and the first connecting seat or the second connecting seat. The first connecting seat and the second connecting seat are relatively close in the axial direction to make the first butt joint part of the first butt joint pipe and the second butt joint part of the second connecting pipe relatively connected, and the elastic member is deformed to store energy so that the deformation force of the elastic member is not less than the end face pressure of the working medium acting on the first butt joint pipe or the second connecting pipe after the working medium is introduced into the first butt joint pipe and the second connecting pipe during operation, so that the first butt joint part and the second butt joint part do not leak working medium.

[0009] Wherein, after the connection is completed, the elastic piece is in a deformed state and continuously applies an elastic force to the first connecting pipe, which is different from the hard contact of the two interfaces and the sealing piece between the two interfaces to contact through the sealing piece. The hard contact or the sealing piece contact in the past will cause at least one of the two interfaces to be slightly or deformed, and the deformation will cause the sealing effect between the two interfaces to be poor or strong. The elastic force described above does not have a sealing piece, and the two interfaces do not need to be deformed, but the deformation of the elastic piece itself compensates. This can ensure that within the preset pressure range (i.e. the end face pressure is not greater than the deformation force), the increase and decrease of the end face pressure will cause the deformation force to decrease accordingly to keep the two interfaces sealed.

[0010] According to the above scheme, after the first connecting pipe and the second connecting pipe are connected to each other by the sealing connection device, and the working medium in the medium pipeline formed by the first connecting pipe and the second connecting pipe does not leak between the first connecting part and the second connecting part when the working medium does not exceed the preset upper limit pressure value, the sealing property of the medium pipeline can be ensured. In the sealing connection device, no additional sealing piece is used at the connection of the two connecting pipes, which can avoid the sealing piece being frozen and becoming brittle, affecting the sealing effect of the connection, and also can avoid the product stability caused by the sealing piece being frozen and the service life being reduced. When the working medium starts to flow or stops flowing, the medium pressure in the medium pipeline will fluctuate. When the working medium continuously flows and works stably, the medium pressure in the medium pipeline may also fluctuate due to the change of the medium pressure. The above pressure fluctuation will cause the end face pressure acting on the first connecting pipe or the second connecting pipe to fluctuate accordingly, thereby destroying the original force balance. At this time, the elastic piece can quickly and gently resist the end face pressure fluctuation, so that the first connecting part and the second connecting part always keep contact and sealing without working medium leakage.

[0011] According to the sealing connection device, the locking mechanism gradually locks the first connecting seat and the second connecting seat after they are relatively close in the axial direction, and the degree of deformation of the elastic member is adjusted by gradually increasing the axial displacement of the first connecting seat relative to the second connecting seat when the locking mechanism is gradually locked, so that the deformation force of the elastic member is gradually increased until a preset requirement is met. Since the deformation force of the elastic member is positively correlated with the deformation amount, the minimum deformation force required by the connecting pipe can be calculated according to the end face pressure generated by the medium flowing into the connecting pipe during work, and the minimum requirement for the axial displacement amount of the elastic member can be calculated according to the deformation characteristics of the elastic member. When the user connects, the user only needs to ensure that the axial displacement amount of the gradually locked locking mechanism meets the requirement to meet the connection sealing requirement. For example, a rack-shaped array structure is arranged on the first connecting seat and the second connecting seat in the axial direction, and a tooth block is arranged to move in the radial direction. When the tooth block is matched at different positions of the rack, the displacement of the two connecting seats in the axial direction is increased or decreased. The user can push one connecting seat to approach the other connecting seat in the axial direction to gradually increase the deformation force of the elastic member. Alternatively, the two connecting members are sleeved with each other, and internal and external threads or guide grooves and guide blocks are arranged on the inner and outer walls of the two connecting members, so that the axial distance between the two connecting seats is reduced by relative rotation of the two connecting seats to gradually increase the deformation force of the elastic member. The gradual locking structure can gradually match the connection process.

[0012] According to the sealing connection device, the first connecting part and the second connecting part are a connecting female cavity and a connecting male head, respectively, and the connecting male head is at least partially inserted into the connecting female cavity to be connected. After the connecting male head is inserted into the connecting female cavity, the end face of the connecting male head is subjected to fluid pressure in the first connecting pipe or the second connecting pipe to form an end face pressure. By inserting the connecting male head into the connecting female cavity and making the working medium flow from the first connecting pipe to the second connecting pipe, the working medium can generate pressure on the end face of the connecting male head when flowing to form an end face pressure. The end face pressure acts on the second pipe and has the same direction as the deformation force of the elastic member, so that the deformation force of the elastic member decreases when the end face pressure increases. Therefore, after the connection is completed, the elastic member can compensate for the fluctuation of the end face pressure, and the deformation force is not less than the set end face pressure, which can ensure that the connecting female cavity and the connecting male head always remain in contact and will not be disconnected to cause leakage of the working medium.

[0013] According to the sealing connection device, the connecting female cavity is provided with a tapered connecting member, and the front end of the connecting male head is sleeved with a contact member having a tapered outer surface. The connecting male head is inserted into the tapered connecting member to form a tapered contact surface, so that the connecting pipe is sealed by the mutual contact between the contact member and the tapered connecting member. The contact member is preferably made of polytetrafluoroethylene or the like.

[0014] According to the sealing connection device, the first connecting seat is an interface, the second connecting seat is a handle, and the locking mechanism is a locking ring. The first connecting pipe is a first connecting pipe, and the second connecting pipe is a second connecting pipe. The first connecting pipe and the second connecting pipe are arranged in an axial direction. The first connecting pipe is movably arranged in the axial direction relative to the first connecting seat, and the second connecting pipe is fixedly arranged in the axial direction relative to the second connecting seat or movably arranged in the axial direction. The first connecting part is a female end connector, and the second connecting part is a male end connector. The female end connector has a female end cavity to form a female end connector, and the male end connector has a male end head inserted into the female end cavity to form a male end connector. Through such a structure design, the sealing connection device is formed on the refrigeration device body and the handle as two parts, which is easy to manufacture and convenient to use.

[0015] According to the sealing connection device, the male end head is locked by a pipeline locking structure after being inserted into the female end cavity. The pipeline locking structure includes a first limiting part and a second limiting part arranged on the side walls of the female end connector and the male end connector, respectively, a limiting piece movably arranged in a radial direction, and a limiting top piece for controlling the movement of the limiting piece. The first limiting part and the second limiting part are limiting holes or limiting grooves. After the male end connector is inserted into the female end connector, the first limiting part and the second limiting part correspond in the radial direction, the limiting top piece moves to control the displacement of the limiting piece between the first limiting part and the second limiting part, and when the limiting piece is fitted in the first limiting hole and the second limiting hole at the same time, the female end connector and the male end connector can be locked, and when the limiting piece is fitted in one of the limiting holes, the two can be unlocked. By the radial displacement of the limiting piece, the female end connector and the male end connector are locked or unlocked, which is very convenient in operation and the connection is firm after locking. The displacement mode of the limiting top piece can be various, including but not limited to: being arranged in a radial direction to push or prevent the radial displacement of the limiting piece, or being directly translated or rotated in an axial direction to be translated in the axial direction to push or prevent the radial displacement of the limiting piece. For the limiting piece, it can be directly displaced in the radial direction under the action of the limiting top piece, or a spring or other elastic member is arranged on the other side of the limiting piece to keep it in contact with the limiting top piece, and the displacement of the limiting piece under the action of the spring is adjusted by the radial displacement of the limiting top piece.

[0016] According to the sealing connection device, the pipeline locking structure comprises a limiting member hole on the side wall of the female end cavity, a limiting groove on the outer wall of the male end head, a limiting member movably arranged in the limiting member hole or the limiting groove in the radial direction, and a mounting disc sleeved on the female end connector for controlling the radial movement of the limiting member. The limiting member is a limiting bead, and the mounting disc is provided with an opening to form a limiting top piece. An axially arranged first opening and a second opening are formed on the inner wall of the opening, and the inner diameter of the first opening is larger than that of the second opening. The limiting member is switched between cooperation with the first opening and cooperation with the second opening by axial displacement or spiral rotation of the mounting disc, so as to lock or unlock the two pipe fittings. Of course, in other embodiments, when the locking function and the axial locking function of the limiting device are separated, the first opening and the second opening can be arranged in the circumferential direction, so that the two pipe fittings can be locked by the preliminary rotation of the mounting disc, and further axial displacement is achieved by further rotation of the mounting disc, so as to realize the purpose of locking and axial step-by-step locking. The radially movable limiting bead as the limiting member can be simple in structure, easy to manufacture and convenient to use.

[0017] According to the sealing connection device, the locking mechanism comprises a driving member and a mounting disc. The rear end of the driving member is sleeved on the first connecting seat, and the inner wall of the first connecting seat and the outer wall of the driving member are respectively provided with first rotation guide and second rotation guide to form a spiral cooperation between the driving member and the first connecting seat. The first rotation guide and the second rotation guide form a first spiral structure, and the mounting disc is provided with an opening arranged in the axial direction to allow the guide to be sleeved therein and movably arranged in the first connecting seat in the axial direction. The driving member is connected between the mounting disc and the driving member through an axial connecting member, so that the rotation of the driving member relative to the first connecting seat drives the mounting disc to move in the axial direction in the first connecting seat. The spiral cooperation between the driving member and the first connecting seat is formed by the first spiral structure, so that the labor-saving effect can be achieved, which is more friendly to operate compared with the mode that the user needs to directly apply force to relatively close the first connecting seat to the second connecting seat in the axial direction.

[0018] According to the sealing connection device, the elastic member comprises at least one spring, and the two ends of the spring are respectively abutted against the first connecting seat and the first connecting pipe and are compressed and deformed to store energy. The spring is used as the elastic member, which is practical, and a plurality of springs can be connected in series to achieve different stage energy storage effects.

[0019] According to the sealing connection device, the axial connecting member is a second screw structure, and the second screw structure comprises third rotation guides and fourth rotation guides arranged on the outer wall of the mounting disc and the inner wall of the driving member respectively, so that the mounting disc and the driving member are screw-connected. The mounting disc and the driving member are arranged to be axially movable by adopting the screw structure. On the one hand, the existing structure can be utilized, and on the other hand, the displacement ratio of the driving member and the mounting disc in the axial direction can be controlled by the pitches of the first screw structure and the second screw structure. When the pitch of the second screw structure is greater than that of the first screw structure, the driving member can drive the mounting disc to move in the axial direction with a greater displacement, so that the rotation angle or the number of turns of the driving member can be reduced. When the pitch of the second screw structure is less than that of the first screw structure, the driving member can drive the mounting disc to move in the axial direction with a smaller displacement, so that the torque of the driving member can be reduced to save power. When the pitches are equal, the mounting disc and the driving member move in the axial direction by an equal amount.

[0020] According to the sealing connection device, the first screw structure or the second screw structure is composed of internal threads and external threads matched with each other. The screw connection formed by the internal threads and the external threads is more stable and less likely to shake.

[0021] According to the sealing connection device, the first screw structure or the second screw structure is composed of guide grooves arranged to rotate along the inner wall or the outer wall and guide blocks matched in the guide grooves. The cooperation of the guide grooves and the guide blocks can make the axial displacement of the driving member or the mounting disc larger and make the driving member or the mounting disc rotate faster under the torsion.

[0022] According to the sealing connection device, the axial connecting member is a push block arranged on the driving member, and the push block acts on the end face or the annular groove of the mounting disc, so that the push block can drive the mounting disc to move in the axial direction with the rotation of the driving member, thereby achieving the purpose of deforming the elastic member to store energy by rotating the driving member to drive the first connecting pipe to move in the axial direction.

[0023] According to the sealing connection device, the first connecting seat comprises a mounting shell and a mounting body slidingly arranged in the mounting shell, the first connecting pipe is fixed to the mounting body to slide with the mounting body, and the elastic member acts between the mounting shell and the mounting body. The front end of the driving member is formed with a first top contact part, and the rear end of the mounting body is correspondingly provided with a second top contact part. The first top contact part and the second top contact part abut against each other to make the mounting body move in the mounting shell under the rotation and driving of the driving member to compress the elastic member and deform the elastic member to store energy.

[0024] According to the sealing connection device, the first connecting seat comprises a mounting shell and a mounting body fixedly connected with the mounting shell, and the first connecting pipe is slidingly arranged in the mounting body in the axial direction. The elastic member acts between the first connecting pipe and the mounting shell or the mounting body.

[0025] According to the sealing connection device, the driving member pushes the first connecting pipe member or the male end to slide relative to the mounting body to compress the elastic member to store energy.

[0026] According to the sealing connection device, the first opening and the second opening are two limit rings with different inner diameters arranged in sequence along the axial direction, and the two limit rings are connected by a guide ring formed by a tapered surface.

[0027] According to the sealing connection device, a guide surface is arranged on the inner side wall of the limit groove to push the limit member to displace radially outward in the limit member hole when the second connecting pipe member is separated.

[0028] According to the sealing connection device, the elastic member includes a spring partition and first and second spring members arranged on the two sides of the spring partition respectively, and the elastic coefficients of the first and second spring members are different.

[0029] According to the sealing connection device, a connecting member for the elastic member to abut against is arranged on the outer wall of the first connecting pipe member, and the first and second spring members are sleeved on the first connecting pipe member.

[0030] A sealing connection device includes a first connecting seat provided with a first connecting pipe member, and a second connecting seat provided with a second connecting pipe member.

[0031] The first connecting pipe member is provided with an elastic member between the first connecting seat and / or the second connecting seat, and the first connecting seat and the second connecting seat are axially close to each other to be connected to each other. During the connection process, the first connecting part of the first connecting pipe member and the second connecting part of the second connecting pipe member are sealingly connected, and then the connected pipe member formed by the first connecting pipe member and the second connecting pipe member is axially translated relative to the first connecting seat or the second connecting seat to deform the elastic member to store energy. After the connection is completed, the deformation force of the elastic member is not less than the end face pressure of the first connecting pipe member or the second connecting pipe member to prevent leakage of the working medium at the connection between the first connecting part and the second connecting part.

[0032] According to the sealing connection device, the connection process includes two steps of pipe connection and pipe fastening. During the pipe connection, force is applied to make the first connecting seat and the second connecting seat (axially connected and relatively translated to deform the elastic member to store energy with a deformation force not less than the end face pressure), and the first connecting seat and the second connecting seat are fastened by a fastening member in the connected state.

[0033] According to the aforementioned sealing connection device, the docking process is completed step by step as a whole. Therefore, the sealing connection device further includes a locking mechanism. After the first connecting seat and the second connecting seat approach each other in the axial direction, they are gradually locked by the locking mechanism until the deformation force of the elastic element is not less than the end face pressure. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the sealing connection device in Embodiment 1;

[0035] Figure 2 This is a cross-sectional view of the connecting device in the locked state in Embodiment 1;

[0036] Figure 3 yes Figure 2 Enlarged view of region A in the middle;

[0037] Figure 4 This is a partial structural diagram of the connecting device in the unlocked state in Embodiment 1. Figure 3 A diagram illustrating the transition to the unlocked state;

[0038] Figure 5 This is a schematic diagram of the connector handle in Embodiment 1;

[0039] Figure 6 This is a schematic cross-sectional view of the docking structure of the first connecting pipe fitting and the second connecting pipe fitting in Embodiment 1;

[0040] Figure 7 This is a cross-sectional view of the sealing connection device in the unlocked state according to Embodiment 2 of the present invention;

[0041] Figure 8 yes Figure 7 A cross-sectional view of the sealing connection device in the locked state according to the embodiment.

[0042] In the figure: first connecting seat 1, second connecting seat 2, locking mechanism 3, elastic member 5, mounting shell 11, mounting body 12, first connecting pipe 13, sliding cavity 110, end plate 111, elastic connecting seat 112, female pipe hole 113, first connecting part 131, connecting female cavity 132, limiting member hole 133, limiting member 134, first connecting pipe body 135, first connecting pipe end 136, joint handle 21, second connecting pipe 22, second connecting part 221, connecting male head 222, limiting groove 223, contact member 224, tapered connecting member 225, first spiral structure 151, second spiral structure 152, threaded connection structure 153, driving member 31, mounting disc 32, opening 321, first opening 322, second opening 323, guide ring 324, end push block 325, clamping ring 326, guide surface 2231, female pipe 331, locking pipe 332, handle connecting cavity 301, connecting member 51, bearing structure 16, bearing ring 161, ball 162, limiting outer hole 1331, limiting inner hole 1332. DETAILED DESCRIPTION

[0043] The application will be further described below by way of examples in conjunction with the accompanying drawings.

[0044] Example 1

[0045] Reference Figures 1-6 As shown in the figure, a sealing connecting device can be used in a cryogenic treatment device to achieve detachable pipe connection between two parts, for example, it is used for pipe sealing connection between a cryogenic device main body and a functional member such as a handle for operation.

[0046] The sealing connecting device includes a first connecting seat 1, a second connecting seat 2 opposite to the first connecting seat 1 to be detachably connected with the first connecting seat 1, and a locking mechanism 3 for connecting and locking the first connecting seat 1 and the second connecting seat 2. Among them, the first connecting seat 1 is provided with a first connecting pipe 13 arranged in the axial direction, and the first connecting pipe 13 is movably arranged in the axial direction relative to the first connecting seat 1 (of course, the first connecting pipe 13 can also be rotatable along its axial direction), the second connecting seat 2 includes a joint handle 21 and a second connecting pipe 22 arranged in the axial direction, and the second connecting pipe 22 is fixedly arranged in the axial direction relative to the second connecting seat 2 and cannot be movably arranged in the axial direction like the first connecting pipe 13.

[0047] In the present embodiment, the locking mechanism 3 is rotatably arranged relative to the first connecting seat 1 to achieve relative translation of the locking mechanism 3 relative to the first connecting seat 1 in the axial direction by relative rotation to approach or move away. Of course, in other embodiments, the locking mechanism 3 can also be replaced by only having a locking function, i.e. first axially displacing the second connecting seat 2 relative to the first connecting seat 1 to a predetermined position, and then locking the axial displacement of the second connecting seat 2 relative to the first connecting seat 1 by the locking mechanism 3 while maintaining the predetermined axial fit.

[0048] The front end of the first connecting pipe 13 is formed with a first connecting portion 131 including a connecting female cavity 132 and a limiting member hole 133 on the side wall of the connecting female cavity 132, and the front end of the second connecting pipe 22 is formed with a second connecting portion 221 including a connecting male head 222 insertable into the connecting female cavity 132 and a limiting groove 223 on the outer wall of the connecting male head 222. A limiting member 134 is arranged radially movably between the limiting member hole 133 and the limiting groove 223 to be locked in both or unlocked from the limiting groove 223. When the connecting male head 222 is inserted into the connecting female cavity 132, the limiting member 134 is displaced radially inward in the limiting member hole 133 to be locked in both the limiting member hole 133 and the limiting groove 223 to lock the second connecting pipe 22 in the first connecting pipe 13 to achieve the connection and locking of the second connecting pipe 22 and the first connecting pipe 13. Conversely, when it is necessary to separate the second connecting pipe 22 and the first connecting pipe 13, the limiting member 134 can be displaced radially outward to be unlocked from the limiting groove 223. Such a quick locking / unlocking structure can achieve quick and safe locking of the second connecting pipe 22 and the first connecting pipe 13 to meet the use requirements of the sealing connection device.

[0049] In addition, since the first connecting pipe 13 and the second connecting pipe 22 are inserted and locked as described above, the arrangement positions of the first connecting pipe 13 and the second connecting pipe 22 can also be reversed, i.e. the second connecting pipe 22 is movably arranged in the first connecting seat 1 and the first connecting pipe 13 is fixedly arranged on the second connecting seat 2. Of course, in other embodiments, the second connecting pipe 22 and the first connecting pipe 13 can also be both movably arranged in the axial direction.

[0050] In the present embodiment, the limiting member 134 is arranged to move radially inwardly or outwardly in the limiting member hole 133 to lock or unlock the second connecting pipe member 22 and the first connecting pipe member 13, which is locked when the limiting member 134 at least partially protrudes from the limiting member hole 133 to be clamped in the limiting slot 223, and which is unlocked when the limiting member 134 is disengaged from the limiting slot 223. However, this is only one of the pipe locking structures in the present embodiment, and other pipe locking structures can also be used. For example, in other embodiments, the limiting member 134 can be arranged to move radially on the connecting male head 222 and be kept in a radially outward position by a spring 5. There is no radially movable plunger in the limiting member hole 133. When the plunger is in the limiting member hole 133, the limiting member 134 cannot be clamped therein, thus achieving an unlocked state. When the plunger is displaced radially outwardly by a proper distance, the inner side of the limiting member hole 133 is empty, allowing the limiting member 134 to be clamped in the limiting member hole 133 under the action of the spring 5, thus locking the second connecting pipe member 22 and the first connecting pipe member 13, forming a pipe locking structure. Alternatively, a plunger arranged to move radially inwardly or outwardly can also be used to form a pipe locking structure, thus achieving the locking or unlocking of the second connecting pipe member 22 and the first connecting pipe member 13 after they are connected.

[0051] In the present embodiment, a spring 5 is arranged between the first connecting pipe member 13 and the first connecting seat 1, with both ends of the spring 5 acting on the first connecting pipe member 13 and the first connecting seat 1, respectively. Thus, when the second connecting pipe member 22 and the first connecting pipe member 13 are connected, the two members are further displaced relative to the first connecting seat 1, causing the spring 5 to be compressed and deformed to store energy. After the sealing connecting device connects the second connecting pipe member 22 and the first connecting pipe member 13, the spring 5 remains in a compressed and energized state, and exerts a force on the connection between the second connecting pipe member 22 and the first connecting pipe member 13 to ensure sealing. For example, in the present embodiment, the spring 5 includes at least one spring, with both ends of the spring abutting the first connecting pipe member 13 and the first connecting seat 1, respectively, and being compressed and energized to seal. Of course, in other embodiments, the spring 5 can be stretched and deformed to store energy.

[0052] In the present embodiment, the sealing connecting device can be divided into the following stages during the connection of the two parts that are separated from each other into an integrated whole.

[0053] Firstly, the second connecting pipe 22 and the first connecting pipe 13 are respectively in a position away from each other, and the two are not in contact, and at least one of the two is translated in the axial direction to relatively approach. Secondly, the second connecting pipe 22 and the first connecting pipe 13 are in contact with each other to butt joint to form an integral, which can be referred to as a butt joint pipe. Thirdly, the driving butt joint pipe is further displaced relative to the first connecting seat 1 to deform the elastic member 5 to store energy until it is locked by the locking mechanism 3, so that the first connecting seat 1, the second connecting seat 2 and the locking mechanism 3 form a sealed connecting device that does not produce relative motion.

[0054] In particular, after the above-mentioned sealed connecting device is formed, the deformation force exerted on the first butt joint pipe 13 by the elastic member 5 deformed to store energy is not less than (that is, greater than or equal to) the end face pressure exerted on the front end face of the second connecting pipe 22 by the working medium (such as liquid nitrogen) passing through the butt joint pipe of the sealed connecting device, so that the butt joint of the second connecting pipe 22 and the first butt joint pipe 13 can be ensured not to leak the working medium (such as liquid nitrogen).

[0055] Therefore, the second connecting pipe 22 and the first butt joint pipe 13 in the device of the embodiment are elastically butted and sealed, and for sealing, only the end face of the second connecting pipe 22 needs to be subjected to the pressure of the fluid in the pipe during work, which is less than the deformation restoring force of the elastic member 5.

[0056] In addition, the elastic butt joint has an additional effect on the butt joint of the second connecting pipe 22 and the first butt joint pipe 13 in addition to the above-mentioned sealing. After adopting the elastic butt joint structure of the embodiment, the displacement amount of the movable body relative to the first connecting seat 1 in the axial direction can be controlled to control the butt joint degree to meet the design requirements, and the elastic member 5 can also provide good buffering effect when the pipe pressure fluctuates, without the need for micro-variation of the material of the part itself or deformation of the soft buffer in the prior art.

[0057] Specifically, the sealing between the second connecting pipe 22 and the first butt joint pipe 13 in the embodiment is provided by the deformation force of the elastic member 5 deformed to store energy, so that the butt joint pipe of the sealed connecting device and the butt joint main body (the butt joint main body refers to other components other than the butt joint pipe) form a flexible connection. Figure 2 As shown, the deformation force of the elastic member 5 acts on the first butt joint pipe 13 in the right direction, and the end face pressure of the second connecting pipe 22 when passing through the working medium is in the right direction, and the directions are the same; and the locking mechanism 3 applies a left locking force to the second connecting pipe 22, and the three form a force balance.

[0058] After the butt joint is completed and before the working medium is introduced, the deforming force of the elastic member 5 and the locking force of the locking mechanism 3 are equal in size and opposite in direction to cancel each other out; after the working medium such as liquid nitrogen is introduced, the working medium flows from the first butt joint pipe member 13 to the second connecting pipe member 22, the pressure of the working medium acts on the front end face of the second connecting pipe member 22 to generate an end face pressure, the first butt joint pipe member 13 is displaced to the right to reduce the deformation of the elastic member 5 and the deforming force of the elastic member 5, and the reduction is equal to the size of the end face pressure, so that the sealing connection device is reformed into a force balance state; during the operation of the refrigeration equipment, if the medium pressure fluctuates, the end face pressure will correspondingly increase or decrease, and the deforming force of the elastic member 5 will correspondingly decrease or increase to maintain the force balance and the sealing effect; when the work is completed and the medium input is closed, the end face pressure disappears, and the elastic member 5 is translated to the left to increase the deforming force to the balance state.

[0059] Therefore, when the pressure of the working medium changes (including the medium being introduced or closed and the pressure fluctuating during work), the end face pressure correspondingly increases or decreases, and the elastic member 5 can timely stretch and contract to respond, so that the sealing connection position as a whole is formed into a new force balance state.

[0060] Since the second connecting pipe member 22 is inserted and matched with the first butt joint pipe member 13, as long as the resultant force between the two does not separate the second connecting pipe member 22 outward, the sealing effect at the butt joint can be ensured to be unaffected, and the elastic member 5 can be self-adaptively stretched and contracted when the pressure in the pipeline changes to ensure sealing, so that the sealing effect can be affected by the pressure fluctuation in the pipeline, and the soft sealing member can avoid the sealing performance and service life being reduced when sealing the working medium such as liquid nitrogen with low temperature and high pressure.

[0061] The first connecting seat 1 and the locking mechanism 3 are mutually sleeved, for example, the front end of the locking mechanism 3 is sleeved in the rear end of the first connecting seat 1. The inner wall of the first connecting seat 1 is provided with a first rotation guide, and the outer wall of the locking mechanism 3 is correspondingly provided with a second rotation guide. The first rotation guide and the second rotation guide can be a guide block provided on the outer wall of the locking mechanism 3 or the inner wall of the first connecting seat 1 and a guide groove spirally provided along the inner wall of the first connecting seat 1 or the outer wall of the locking mechanism 3, so that the locking mechanism 3 is screwed into or out of the first connecting seat 1 by the guide block spirally sliding in the guide groove, so that the locking mechanism 3 produces relative displacement in the axial direction relative to the first connecting seat 1. In the embodiment, the guide block and the guide groove are replaced by external threads spirally provided on the outer wall of the locking mechanism 3 and internal threads spirally provided on the inner wall of the first connecting seat 1, which are matched to rotate relative to each other. This can be regarded as a special case of the guide block and the guide groove. Therefore, the first rotation guide and the second rotation guide are matched to form a first spiral structure 151, so that the first connecting seat 1 and the second connecting seat 2 are gradually locked by the locking mechanism 3 in the axial direction through the screwing cooperation of the first spiral structure 151, and the elastic member 5 is gradually deformed to store energy to make the connection process and result continuous and controllable.

[0062] Of course, it is also feasible that the first connecting seat 1 is sleeved in the locking mechanism 3 in other embodiments.

[0063] Therefore, in the embodiment, the first connecting seat 1 is formed by the interface member, the second connecting seat 2 is formed by the joint handle, the first connecting pipe member 13 is formed by the female end joint, and the second connecting pipe member 22 is formed by the male end joint.

[0064] In the embodiment, the locking mechanism 3 includes a driving member 31 and a mounting disc 32. The mounting disc 32 is provided with an opening 321 corresponding to the first connecting pipe member 13. The first connecting part 131 of the first connecting pipe member 13 is sleeved in the opening 321. The inner wall of the opening 321 is formed with a first opening 322 and a second opening 323 spaced apart in the axial direction, and the inner diameter of the first opening 322 is greater than that of the second opening 323. When the second opening 323 is located outside the limiting member hole 133, the top of the limiting member 134 is in contact with the limiting member 134 to displace radially inward to be clamped in the limiting groove 223 to lock the second connecting pipe member 22 and the first connecting pipe member 13. When the first opening 322 is located outside the limiting member hole 133, the limiting member 134 is allowed to displace radially outward to at least partially locate in the first opening 322 to separate from the limiting groove 223 to be unlocked. The inner side wall of the limiting groove 223 is provided with a guide surface 2231 to push the limiting member 134 to displace radially outward in the limiting member hole 133 when the second connecting pipe member 22 is displaced outward to be separated, and the outer side wall of the limiting groove 223 can be a straight plane or a guide surface.

[0065] The first opening 322 and the second opening 323 can be two annular surfaces with different inner diameters, or can be two portions with different inner diameters in a tapered surface or a curved surface with decreasing inner diameter. In the embodiment, the former is adopted and a tapered surface is arranged between the first opening 322 and the second opening 323 to form a guide surface. By adopting the opening with axially gradually changing inner diameter, including continuous gradually changing inner diameter and stepped gradually changing inner diameter, the switching between the locking state and the unlocking state can be realized by the cooperation between the displacement of the mounting disc 32 along the axial direction and the limiting member 134, and the displacement of the mounting disc 32 can also be driven by the rotation of the driving member 31, so that the user only needs to rotate the driving member 31 to realize the locking of the connection and the deformation loading of the elastic member 5 or the deformation cutting of the elastic member 5 and the unlocking of the connection, that is, the user only needs to perform the rotation operation and does not need other complex operations.

[0066] In the embodiment, the first connecting seat 1 includes a mounting shell 11 and a mounting body 12 slidingly arranged in the mounting shell 11, wherein the mounting shell 11 is used to form a relatively fixed component, the first connecting pipe member 13 is fixedly connected to the mounting body 12 to slide in the mounting shell 11, and the elastic member 5 acts between the mounting shell 11 and the mounting body 12 to store energy after deformation. In this way, the mounting body 12 also constitutes part of the movable body.

[0067] In order to realize the specific structural cooperation, the mounting shell 11 is arranged in a hollow tubular shape, the front and rear ends thereof are respectively formed as openings, the inner wall of the rear end opening is provided with an internal thread to form a guide groove for cooperation with the locking mechanism 3, and an end plate 111 is fixedly connected at the front end opening, so that the mounting body 12 can be put into the front end opening and then the front end opening is sealed by the end plate 111, and the two ends of the elastic member 5 abut against the end plate 111 and the mounting body 12 respectively to compress the elastic member 5 to store energy. The end plate 111 is provided with a female pipe hole 113 for the first connecting pipe member 13 to pass through in the axial direction, and an elastic connecting seat 112 is formed around the female pipe hole 113 to abut against the elastic member 5. In this way, the first connecting pipe member 13 can be guided by the mounting body 12 to slide in the mounting shell 11 to make the axial displacement more stable.

[0068] Preferably, a limiting step is arranged at the front end opening of the mounting shell 11, and the second rotating guide is arranged on the inner wall of the limiting step, so that the sliding stroke of the mounting body 12 is limited between the end plate 111 and the limiting step, i.e. the limiting step serves to limit the displacement stroke of the mounting body 12 and to provide a space for the second rotating guide. Of course, a limiting step for limiting the sliding stroke of the mounting body 12 can also be arranged inside the second rotating guide, i.e. the limiting step for limiting the displacement stroke of the mounting body 12 is arranged separately from the second rotating guide. In this case, the inner diameter of the second rotating guide can be the same as the inner diameter of the sliding cavity 110 formed in the mounting shell 11 for the sliding of the mounting body 12.

[0069] As shown in Figure 5 The first connecting pipe 13 includes a first connecting pipe body 135 and a first connecting pipe end 136, the first connecting pipe body 135 is inserted into the first connecting pipe end 136 to be connected therewith, a female cavity 132 is formed in the first connecting pipe end 136, and a limiting member hole 133 is arranged through the side wall of the first connecting pipe end 136 to communicate with the female cavity 132. The limiting member hole 133 further forms a limiting outer hole 1331 and a limiting inner hole 1332 at the outer wall and the side wall of the first connecting pipe end 136 respectively, and the limiting outer hole 1331 is larger than the limiting inner hole 1332. A contact member 224 is arranged on the front end of the male head 222, which has a tapered outer surface, and a tapered connecting member 225 is arranged in the end surface of the first connecting pipe body 135, the front end of the male head 222 is inserted into the first connecting pipe body 135, and the contact member 224 is in contact with the tapered connecting member 225 to form a sealed connecting pipe.

[0070] In the embodiment, the first connecting pipe 13 includes a female pipe 331 and a locking pipe 332, the limiting member hole 133 is arranged through the locking pipe 332 and the limiting member 134 cannot pass through the limiting member hole 133 completely, i.e. the diameter of the limiting inner hole 1332 is smaller than the diameter of the limiting member 134. The locking pipe 332 is fixedly connected to the mounting body 12 through the threaded connection structure 153, and the female pipe 331 is fixedly connected to the locking pipe 332, so that the female pipe 331, the locking pipe 332 and the mounting body 12 form a fixed connection relationship for integral sliding. The female pipe 331 and the locking pipe 332 can be threadedly connected, welded, clamped or interference-fitted to be fixedly connected, or the female pipe 331 and the locking pipe 332 can be integrally formed. The locking pipe 332 and the mounting body 12 are preferably threadedly connected or welded to facilitate processing, and of course, they can also be integrally formed.

[0071] The locking mechanism 3 is formed with a hollow installation cavity, and the installation disc 32 is sleeved in the installation cavity. When the driving member 31 is screwed in or out, the installation disc 32 is not rotatable but axially translatable relative to the driving member 31. The rear end inner wall of the driving member 31 is provided with a first limiting part, which is an end pushing block 325 protruding from the inner wall of the driving member 31. The end pushing block 325 acts on the outer end surface of the installation disc 32 to push the installation disc 32 to move axially inward when the driving member 31 is screwed in, so that the limiting member 134 is changed from cooperating with the first opening 322 to cooperating with the second opening 323, so as to lock the second connecting pipe 22 with the first connecting pipe 13.

[0072] When the driving member 31 is screwed out, it moves axially outward relative to the installation disc 32. In order to make the installation disc 32 also move synchronously, a second clamping part can be provided on the inner end inner wall of the driving member 31, which acts on the inner end surface of the installation disc 32 to drive it to move axially outward synchronously with the driving member 31. Preferably, the second clamping part can be formed by a clamping ring 326 clamped on the inner wall of the installation cavity, so that the driving member 31 and the installation disc 32 can be assembled into a whole locking mechanism 3, which is convenient for manufacturing and use after assembly. In this embodiment, the end pushing block 325 and the clamping ring 326 are jointly formed as a second spiral structure 152. Of course, in other embodiments, the second limiting part can not be provided, but the installation disc 32 can be pushed to move axially outward by the elastic force of the elastic member 5.

[0073] In other embodiments, the second spiral structure 152 can also be composed of pushing blocks and ring grooves arranged in a convex-concave manner along the circumference on the inner wall of the driving member 31 and the outer wall of the installation disc 32, respectively. For example, pushing blocks are protruded on the inner wall of the driving member 31, and ring grooves are concavely arranged along the circumference on the outer wall of the installation disc 32, so as to realize rotary cooperation and drive the installation disc 32 to move axially by the rotation of the driving member 31.

[0074] In this embodiment, the front end of the driving member 31 is formed with a first top contact part, and the rear end of the installation main body 12 is correspondingly provided with a second top contact part. The first top contact part abuts against the second top contact part to drive the installation main body 12 to move in the installation housing 11 under the pushing of the driving member 31 to compress the elastic member 5 until the axial displacement amount meets the sealing requirement. The rear end of the driving member 31 is also formed with a handle connecting cavity 301, in which the front end of the second connecting seat 2 is inserted.

[0075] In the embodiment, the elastic member 5 further comprises a spring partition and a first spring member and a second spring member respectively arranged on two sides of the spring partition. The spring member close to the direction of the mating male head 222 is the first spring member, and the elastic member far from the direction of the mating male head 222 is the second spring member. The first spring member and / or the second spring member can be composed of a plurality of springs in series. Alternatively, the first spring member and / or the second spring member is composed of a whole spring. The first spring member and the second spring member have different overall elastic coefficients, so that the elastic member 5 has different compression performances. Preferably, the overall elastic coefficient of the first spring member is smaller than the overall elastic coefficient of the second spring member, so that the first mating pipe member 13 is easily extended out of the mounting body 12, facilitating the mating of the mating male head 222. In addition, the overall spring coefficient of the first spring member is smaller than the overall elastic coefficient of the second spring member, which means that the deformation of the second spring member is smaller under the same force. Therefore, after the mating of the mating male head 222 and the first mating pipe member 13 is completed, the first mating pipe member 13 only needs to overcome the impact of the pressure change in the pipeline with a smaller micro-displacement and a faster response time, so as to have a better sealing effect. Of course, in other embodiments, the spring partition can also be omitted. The outer wall of the first mating pipe member 13 is provided with a connecting member 51 for abutting and cooperating with the elastic member 5, and the first spring member and the second spring member of the elastic member 5 are both sleeved on the first mating pipe member 13. In addition, in some embodiments, the number of spring members of the elastic member 5 can be greater than or equal to 1.

[0076] Embodiment two

[0077] Reference Figures 6-7 As shown in the figure, a sealing connection device, the main structure of which is the same as that of embodiment one, the difference is that in the utility example, the abutting and cooperating of the mounting shell 11 and the mounting body 12 is changed to guiding cooperation, and the bearing structure 16 is further arranged between the driving member 31 and the mounting body 12.

[0078] In the embodiment, the mounting disc 32 is sleeved in the driving member 31, and the outer wall of the mounting disc 32 and the inner wall of the driving member 31 are respectively provided with a second guide block and a second guide groove arranged in a spiral, the second guide block and the second guide groove are combined to form a second spiral structure 152, and the second guide block slides in the second guide groove to make the driving member 31 rotate in or rotate out relative to the mounting disc 32.

[0079] Preferably, the second guide block and the second guide groove are respectively a second external thread arranged on the outer wall of the mounting disc 32 and a second internal thread arranged on the inner wall of the driving member 31, and the two threads cooperate to drive the mounting disc 32 to move axially inward or outward by the driving member 31.

[0080] And, the displacement ratio of the second screw structure 152 in the axial direction is greater than that of the first screw structure 151, so that the displacement amount of the mounting disc 32 in the axial direction is greater than the axial displacement amount of the driving member 31 when the driving member 31 is screwed into or out of the mounting shell 11. Thus, the operation can be simplified, and the operator can achieve a larger axial displacement of the movable body with a small rotation angle.

[0081] Although the driving member 31 and the mounting disc 32 are driven by the second screw structure, and the first limiting portion or the second limiting portion is not required to push the mounting disc 32 to displace in the axial direction, the first limiting portion and the second limiting portion are arranged on the outer side and the inner side of the driving member 31 respectively for the safety and convenience of the equipment, and the axial distance between the first limiting portion and the second limiting portion is greater than that of the first embodiment. In this way, the mounting disc 32 can displace between the first limiting portion and the second limiting portion.

[0082] The rear end of the mounting body 12 is provided with a bearing structure 16, which includes a bearing ring 161 and balls 162. The balls 162 are arranged to roll between the mounting body 12 and the bearing ring 161. The second top contact portion is formed by the end face of the bearing ring 161. The first top contact portion at the front end of the driving member 31 abuts against the end face of the bearing ring as the second top contact portion, so that the driving member 31 rotates smoothly relative to the mounting body 12.

[0083] Embodiment Three

[0084] A sealing connection device, which has the same main structure as the first or second embodiment, is different from the first or second embodiment in that the mounting body 12 is fixedly connected or integrally formed with the mounting shell 11 in the present embodiment, so that the mounting body 12 and the mounting shell 11 do not displace relative to each other in the axial direction.

[0085] The first connecting pipe member 13 is arranged to be movable relative to the mounting body 12 in the axial direction. The movable body composed of the driving member 31, the mounting disc 32, and the first connecting pipe member 13 is displaced relative to the mounting body 12 in the axial direction to compress and deform the elastic member 5 to achieve sealing.

[0086] In the present embodiment, the front end of the driving member 31 no longer contacts the rear end of the mounting body 12. Instead, the driving member 31 directly or indirectly acts on the first connecting pipe member 13 or the second connecting portion 221 to drive them to move away from or close to the mounting body 12 as a whole, so as to compress and deform the elastic member 5 to store energy after deformation, thereby achieving the purpose of sealing connection.

[0087] Of course, the above is only a typical example of the present application. In addition to the above, the present application can have other various specific embodiments. Any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of the present application.

Claims

1. A sealed connection device, characterized by: The utility model relates to a first connecting seat (1), second connecting seat (2) and first butt joint pipe piece (13) and second connecting pipe piece (22) are arranged on first connecting seat (1) and second connecting seat (2) respectively, first butt joint pipe piece (13) is movably arranged along its length direction, and elastic member (5) is arranged between first butt joint pipe piece (13) and first connecting seat (1) or second connecting seat (2). First connecting seat (1) and second connecting seat (2) are relatively close in axial direction to make the first butt joint (131) of first butt joint pipe piece (13) and the second butt joint (221) of second connecting pipe piece (22) are relatively connected, and the deformation force of elastic member (5) is not less than the end face pressure of first butt joint pipe piece (13) or second connecting pipe piece (22) when working medium is passed to make the first butt joint (131) and the second butt joint (221) do not leak working medium. Locking mechanism (3) is further included, and first connecting seat (1) and second connecting seat (2) are gradually locked by locking mechanism (3) after being relatively close in axial direction. Locking mechanism (3) includes driving member (31) and mounting disc (32), the rear end of driving member (31) is sleeved in first connecting seat (1), first rotating guide and second rotating guide are arranged on the inner wall of first connecting seat (1) and the outer wall of driving member (31) respectively to make driving member (31) and first connecting seat (1) are screwing, first rotating guide and second rotating guide are formed into first spiral structure (151), opening (321) is arranged on mounting disc (32) and is sleeved with guide and is movably arranged in first connecting seat (1) along the axial direction;Axial connecting piece is connected between mounting disc (32) and driving member (31) to make the rotation of driving member (31) relative to first connecting seat (1) drive mounting disc (32) to displace in first connecting seat (1) along the axial direction; Elastic member (5) includes at least one spring, and the both ends of elastic member (5) are respectively abutted with first butt joint pipe piece (13) and first connecting seat (1) and are compressed to store energy.

2. The sealed connection device of claim 1, wherein: First butt joint (131) and second butt joint (221) include butt joint female cavity (132) and butt joint male head (222) respectively, butt joint male head (222) is at least partially inserted into butt joint female cavity (132) to make the relative connection of both; Tapered contact piece (225) is arranged in butt joint female cavity (132), contact piece (224) with tapered outer surface is sleeved on the front end of butt joint male head (222), and butt joint male head (222) is inserted into tapered contact piece (225) to form tapered contact surface.

3. A sealed connection device according to claim 2, characterised in that: The first connecting seat (1) is an interface, and the second connecting seat (2) is a connector handle; the first connecting pipe (13) is a first connecting pipe, and the second connecting pipe (22) is a second connecting pipe; the first connecting pipe (13) and the second connecting pipe (22) are both arranged in an axial direction, the first connecting pipe (13) is arranged in an axial direction relative to the first connecting seat (1) in a movable manner, and the second connecting pipe (22) is arranged in an axial direction relative to the second connecting seat (2) in a fixed manner or in a movable manner; The first connecting pipe (13) is a female end connector, and the second connecting pipe (22) is a male end connector; the female end connector has a female end cavity to form a connecting female cavity (132), and the male end connector has a male end head inserted into the female end cavity to form a connecting male head (222).

4. The sealed connection device of claim 3, wherein: The male end head is locked by a pipeline locking structure after being inserted into the female end cavity, the pipeline locking structure comprises first and second limiting portions arranged on the side walls of the female end connector and the male end connector respectively, a limiting member arranged in a radial direction, and a limiting top member for controlling the displacement stroke of the limiting member; the first and second limiting portions are limiting holes or limiting grooves, the first limiting portion and the second limiting portion are radially corresponding after the male end connector is inserted into the female end connector, the limiting top member controls the displacement stroke of the limiting member between the first and second limiting portions, and the limiting member is locked with the female end connector and the male end connector when being fitted in both the first and second limiting portions, and is unlocked with the female end connector and the male end connector when being fitted in one of the first and second limiting portions.

5. The sealed connection device of claim 4, wherein: The pipeline locking structure comprises a limiting member hole (133) on the side wall of the female end cavity, a limiting groove (223) on the outer wall of the male end head, a limiting member (134) arranged in the limiting member hole (133) or the limiting groove (223) in a radial direction, and a mounting disc (32) sleeved on the female end connector for controlling the displacement stroke of the limiting member (134) in the radial direction, the limiting member (134) is a limiting bead, and the mounting disc (32) is provided with an opening (321) to form a limiting top member, the inner wall of the opening (321) is formed with a first opening (322) and a second opening (323) arranged in an axial direction, and the inner diameter of the first opening (322) is larger than that of the second opening (323).

6. The sealed connection device of claim 1, wherein: The axial connecting member is a second spiral structure (152), and the second spiral structure (152) comprises third and fourth rotation guide members arranged on the outer wall of the mounting disc (32) and the inner wall of the driving member (31) respectively, so that the mounting disc (32) and the driving member (31) are screw-connected; The first spiral structure (151) and / or the second spiral structure (152) are composed of an inner thread and an outer thread matched with each other; or the first spiral structure (151) and / or the second spiral structure (152) are composed of a guide groove arranged in rotation on the inner wall or the outer wall and a guide block fitted in the guide groove.

7. The sealed connection device of claim 1, wherein: The axial connecting member is a push block arranged on the driving member (31), and the push block acts on the end face or the ring groove of the mounting disc (32), so that the push block drives the mounting disc (32) to displace in an axial direction with the rotation of the driving member (31).

8. The sealed connection device of claim 1, wherein: The first connecting seat (1) comprises a mounting shell (11) and a mounting body (12) slidingly arranged in the mounting shell (11), the first connecting pipe is fixed to the mounting body (12) to slide with the mounting body (12), and the elastic member (5) acts between the mounting shell (11) and the mounting body (12); the front end of the driving member (31) is formed with a first top contact part, and the rear end of the mounting body (12) is correspondingly provided with a second top contact part, the first top contact part abuts against the second top contact part to drive the mounting body (12) to move in the mounting shell (11) under the rotation and pushing of the driving member (31) to compress the elastic member (5) to store energy after deformation of the elastic member (5); Or, the first connecting seat (1) comprises a mounting shell (11) and a mounting body (12) fixedly connected with the mounting shell (11), the first connecting pipe is arranged in the mounting body (12) in an axial sliding manner, the elastic member (5) acts between the first connecting pipe and the mounting shell (11) or the mounting body (12), and the driving member (31) drives the first connecting pipe or the second connecting part (221) to slide relative to the mounting body (12) to compress the elastic member (5) to store energy after deformation of the elastic member (5).

9. The sealed connection device of claim 5, wherein: The first opening (322) and the second opening (323) are two limit rings with different inner diameters arranged in sequence in the axial direction, and the two limit rings are connected by a guide ring (324) formed by a tapered surface; The inner side wall of the limiting groove (223) is provided with a guide surface (2231) to push the limiting member (134) to displace radially outward in the limiting member hole (133) when the second connecting pipe (22) is separated; The elastic member (5) comprises a spring separator and first and second spring members arranged on two sides of the spring separator, and the elastic coefficients of the first and second spring members are different; the outer wall of the first connecting pipe is provided with a connecting member (51) for abutting against the elastic member (5), and the first and second spring members are both sleeved on the first connecting pipe (13).

Images