217 results about "Buoyant force" patented technology

The invention discloses a marine geological sediment sampling device and method, and belongs to the technical field of sampling equipment. The marine geological sediment sampling device comprises a bottom frame, wherein one side of the bottom frame is a containing box, and the other side of the bottom frame is an inserting rod; the power box is arranged in the containing box through a sliding sealing structure, and a power element is installed in the power box. A sampling pipe in transmission connection with the power element, a floating assembly installed on the power box and an air pipe in the power box are installed among the multiple insertion rods, when the pressure in the cavity reaches a set value of a pressure valve, the valve is opened, compressed air is sprayed to stress blades through the air pipe to drive a first sliding ring to rotate, a floating plate rotates synchronously, and auxiliary propulsive force is generated; the propelling direction is consistent with the sinking direction of the device, the function of accelerating sinking is achieved, seawater resistance is effectively resisted, meanwhile, in a shallow sea area or a deep sea area, the overall buoyancy of the device is changed by dynamically adjusting the inflation volume in the floating plate, and the device can be prevented from violently shaking or inclining due to too fast sinking.

A marine rail lift has a lift deck assembly configured to receive a watercraft thereupon and move between a raised position and a lowered position relative to a parent dock. A plurality of track rails connected to the side walls of a berth of the parent dock define a movement path of the lift deck assembly between the raised position and the lowered position. A plurality of retractable track pins engage the lift deck assembly to the track rails. A lift control system is operatively engaged with the lift deck assembly and configured to displace the lift deck assembly between the raised position and the lowered position. The lift control system manages the volume of air contained within one or more lift tanks of the lift deck assembly to control displacement of the lift deck assembly through buoyant force.

The invention relates to a self-adaptive fault-tolerant generalization control method for an autonomous underwater vehicle, which comprises the following steps of: considering primary and quadratic term damping effects of water, unknown constant matrixes of a mass matrix and an inertia matrix of the autonomous underwater vehicle and external interference factors; an actuator effectiveness index matrix is introduced to model the autonomous underwater vehicle into an under-actuated model, and meanwhile it is ensured that the resultant force of gravity and buoyancy is zero, and kinematics and dynamics equations of the autonomous underwater vehicle are obtained; a controller is designed based on a backstepping method, a position error and a saturation function are defined, a Lyapunov function is selected, the position error is driven to be within a preset fixed constant range, an estimation rule and a projection function are introduced for solving the problem of unknown parameters to calculate thrust and control input, and high-precision trajectory tracking control over the autonomous underwater vehicle is achieved. Compared with the prior art, the method does not need linearization or conversion dynamics, can solve the problems of fault tolerance and time-varying interference, is better in performance, and effectively improves the control precision and stability of the autonomous underwater vehicle.

A subsea catenary riser comprises a rigid riser pipe that is suspended from a floating support on the surface and extends through a sagbend to the seabed. A hang-off interface allows rotation or pivoting of the riser pipe relative to the support about mutually orthogonal horizontal axes. A subsea buoy is positioned on the riser pipe above the sagbend. The buoy applies buoyant upthrust force to the riser pipe via an attachment interface that allows rotation or pivoting of the riser pipe relative to the buoy about mutually orthogonal horizontal axes. In response to movement of the support, the riser pipe deflects with S-shaped curvature to vary the inclination, relative to the buoy, of the portion of the riser pipe to which the buoy is attached. The curvature comprises mutually opposed curves respectively above and below the buoy, joined by a region of inflection that coincides with the buoy.

A flotation device is provided, which comprises: a hull (1) in the form of a buoyancy chamber (1.1), wherein the front end of the hull (1) is equipped with a means (7) for securing a cord, and a cutout (5) is made at the rear end of the hull (1). The hull (1) can be made composite, consisting of the first part (17) of the hull and the second part (18) of the hull, arranged in series along the longitudinal axis of the hull (1) and connected to each other by connecting elements (19) to form of connection that provides possibility of mutual rotation of the first part (17) of the hull relative to the second part (18) of the hull in a vertical plane. The invention increases the efficiency of saving drowning people in open water and reduce mortality during rescuing.

A combined pair of hip waders and life vest device is disclosed. The device includes a buoyant upper body cover portion to cover the upper body of a user and includes a right frontal member and a left frontal member. The right frontal member, the left frontal member, and a back member include floatation devices which include detachable buoyant materials for providing buoyancy to a wearer in water. A right shoulder strap and a left shoulder strap extend from the top edges of the right frontal member and the left frontal member, respectively, to the top edge of the back member. A lower body cover portion functions as hip waders and extends below the upper body cover section. The lower body cover section or portion includes a left leg hip wader and a right leg hip wader.

The invention discloses a buoy seat device capable of automatically finding a bottom and locking a line. The buoy seat device comprises a bottom shell, a linkage rod, a spring, a shell and a buoy connecting seat. Fishing line locking is achieved through dislocation of the bottom shell and a line passing hole in the linkage rod, and the spring provides elastic driving force. When the fishing line is thrown, the downward gravity of the lead weight and the upward buoyancy of the buoy enable the two line passing holes to coincide to release the fishing line, the buoyancy is reduced after the buoy emerges from the water surface, the spring resets, and the two line passing holes are staggered again, so that the line locking effect is achieved. The device is simple in structure, does not need to manually adjust the buoy, can automatically complete bottom finding and line locking, is suitable for various water depth scenes, and can adapt to buoys with different lead feeding amounts by adjusting the preset elastic force of the spring.

The invention provides a control device based on a PLC transformer cooling system, and relates to the technical field of control devices. The fixed seat is fixed on a transformer mounting seat, a cooling box with a rectangular box-shaped structure is fixed on the top end surface of the fixed seat, the cooling box is filled with cooling liquid, and a cover plate is fixed on the top of the cooling box; a first liquid pump is fixed to the top end face of the fixing base, a first liquid inlet pipe and a first liquid outlet pipe are connected to the first liquid pump, and the first liquid inlet pipe and the first liquid outlet pipe are both connected with a transformer cooling oil pipe. A liquid storage box, a liquid supply pipe, a guide rod and a floating block in the supplementing assembly form an automatic liquid supplementing system, and when liquid in the cooling box is reduced due to evaporation or consumption, the liquid in the liquid storage box automatically flows in for supplementing; when the liquid reaches a proper liquid level, the floating block ascends under buoyancy, the liquid supply pipe is sealed, supplement is automatically stopped, it is ensured that the cooling system is always in the optimal working state, and the risk of cooling failure caused by insufficient liquid is effectively avoided.

The invention relates to a relative position attitude calculation method for a non-contact split type satellite of a magnetic levitation stability augmentation mechanism, and belongs to the technical field of spaceflight. Establishing a load cabin position attitude kinetic equation; establishing a relative kinetic equation between the load cabin and the platform cabin; representing eight magnetic levitation forces by using a matrix FL; calculating resultant force FA formed by magnetic levitation force in a magnetic levitation geometric center; according to the resultant force FA, calculating magnetic levitation power DF magnetic acting on the mass center of the load cabin; establishing a calculation equation of the magnetic levitation force fLi, and obtaining a relational expression between the magnetic levitation force fLi and the magnetic levitation gap delta0; establishing a conversion relation between the relative pose of the load cabin relative to the platform cabin and the magnetic levitation gap delta0; the relation between the relative pose of the load cabin relative to the platform cabin and the magnetic levitation force fLi is obtained, that is, the relative pose of the load cabin relative to the platform cabin is obtained through calculation according to the magnetic levitation force fLi; according to the method, the relative position and attitude calculation problem in the process that the load cabin follows the platform cabin based on the magnetic levitation stability augmentation mechanism is solved, and a theoretical model is provided for a non-contact split type satellite following control and vibration suppression system.

A self-contained emitter assembly according to one embodiment is provided to generate and emit X-rays underwater for facilitating X-ray imaging. The self-contained emitter assembly may be operable by a user underwater and may include a float system to provide at least one of neutral buoyancy or negative buoyancy.

A method of preparing a mooring rope for use in a mooring system for a floating offshore structure. The method comprises laying the mooring rope between a buoy and a seabed anchor; and tensioning the mooring rope between a buoyancy force from the buoy and the seabed anchor, thereby elongating the mooring rope towards a worked length condition. In another aspect, there is provided a method of preparing a mooring system for a floating offshore structure. The mooring system has at least one mooring line between a buoy and a seabed anchor, and the mooring line comprises a mooring rope. The method comprises tensioning the at least one mooring line between a buoyancy force from the buoy and the seabed anchor, thereby elongating the mooring rope towards a worked length condition. Preferred embodiments include tensioning the at least one mooring rope or mooring line between a buoyancy force from the buoy and a tensioning device acting against the buoyancy force. The tensioning device may be a part of the mooring system.

The invention discloses a seabed collection system and a collected object lifting method. Belongs to the technical field of underwater collection. The seabed collection robot collects a seabed target collection object; the water surface support ship is communicated with the seabed acquisition robot through the pipe cable system; the seabed collecting robot conveys collected objects to the water surface supporting ship through the pipe cable system serving as a guide cable. According to the buoyancy principle, the air bag is inflated to enable the buoyancy of the target collected object collecting net bag to be larger than the gravity to achieve automatic floating; a pipe cable system is combined to serve as a floating cableway, and a net bag fully loaded with collected objects can be lifted to a moon pool of a water surface supporting ship. The system also adopts an intelligent automatic control technology, and automatically completes the inflation and replacement of a net bag and the recovery of collected objects through the cooperation of an underwater mechanical claw and an on-board collection mechanical claw. The device is suitable for seabed collected objects which have high requirements on the lifting process and are sensitive to impact force, and the working efficiency and the continuity of the system can be greatly improved.

The utility model relates to the technical field of anti-floating anchor rods, and discloses a prestress anti-floating anchor rod which comprises a bottom anchoring plate, three rod bodies and a first triangular plate, the number of the rod bodies is three, and the three rod bodies are fixed to the upper end face of the first triangular plate in an annular array mode. The bottom reinforcing piece is arranged on the lower end face of the bottom anchoring plate and used for reinforcing the bottom end of the bottom anchoring plate; the rod body reinforcing piece is telescopically arranged on the rod body and is used for reinforcing from the upper section of the rod body; the three rod bodies are fixed to the first triangular plate in the annular array mode and matched with the first triangular plate and the second triangular plate, by means of the stability of a triangle, the capacity of resisting building foundation buoyancy can be improved, and the overall stability of the structure is remarkably enhanced; the pressure promotes the connecting column to rise, the top block extrudes the movable block to move outwards to be inserted into a side soil layer, the bottom stability is improved, and the anti-floating capacity is improved.

The invention discloses an anti-floating plate displacement calculation method and system considering soil body distribution rigidity and material nonlinearity. The calculation method comprises the following steps that upward buoyancy borne by a tunnel segment below an anti-floating plate is calculated; calculating the maximum load of the floating force diffused to the overlying soil of the tunnel segment; calculating the equivalent uniform load of the anti-floating plate based on the non-uniform diffusion of the maximum load of the overlying soil body; and based on the elastic foundation beam theory, calculating the displacement of the anti-floating plate by considering the soil body distribution rigidity and the nonlinear coefficient of the anti-floating plate material. According to the method, the characteristics of soil body distribution rigidity and material nonlinearity are combined, and the real displacement condition of the anti-floating plate under the complex working condition can be reflected more accurately.

This invention discloses a passive buoyancy compensation method using gas-liquid mixing for profiling buoys, belonging to the field of buoyancy adjustment technology for marine observation buoys. This method constructs a passive buoyancy compensation system containing gas and liquid chambers, and adjusts the gas-liquid volume ratio to achieve linear and continuous adjustment of the system's equivalent compressibility coefficient, dynamically matching the compression characteristics of seawater at different depths. A mathematical model of the overall force on the buoy is established to determine system design parameters. Sensors are deployed to collect buoy depth and axial acceleration data, calculate motion parameters, predict and estimate the depth, and compare it with the target depth. When the deviation threshold is exceeded, an active fine-tuning judgment process is initiated. Active adjustment is disabled during the inertial-dominated phase, and during the non-inertial phase, the controller sends a fine-tuning command to the active buoyancy system to execute reverse buoyancy adjustment. The passive buoyancy compensation method using gas-liquid mixing provided by this invention can achieve low-power buoyancy control with passive adjustment as the primary method and active adjustment as a secondary method, effectively extending the underwater operational life of the buoy.

The utility model relates to the technical field of swim rings, in particular to an anti-water-inhaling plastic swim ring for children, which comprises a swim ring air bag, the lower surface of the swim ring air bag is fixedly connected with a seat plate, two through holes are arranged in the seat plate, the outer wall of the seat plate is fixedly connected with an auxiliary air bag, and the outer wall of the auxiliary air bag is fixedly connected with the swim ring air bag. The number of the auxiliary air bags is two, a protection structure is arranged on the upper surface of the swim ring air bag, and the protection structure comprises a first bandage and a second bandage. According to the swimming ring air bag, the two feet of a child penetrate through the through holes, the child sits on the seat plate, the protection structure is bound to the upper body of the child to be fixed, meanwhile, the two auxiliary air bags are used for suspending the swimming ring air bag to increase buoyancy, the swimming ring air bag can stably suspend on the water surface, and the situation that the child inhales water due to rollover of the swimming ring air bag is prevented; the protection structure plays a role in protecting children and prevents the children from falling from the inside of the air bag of the swim ring and inhaling water.

The invention discloses a device for preventing a basement bottom plate from floating and leaking, and relates to the technical field of basement anti-floating. A device for preventing a basement bottom plate from floating upwards and leaking comprises a water storage pond buried below a basement and further comprises a bottom cylinder connected to the bottom of the water storage pond, a water inlet pipe and a water outlet pipe. The first anti-floating plate and the second anti-floating plate are arranged on the periphery of the water storage pond respectively; the third anti-floating plate and the anti-floating pipe are arranged on the periphery of the bottom cylinder; the multiple sets of clamping jaw assemblies are arranged on the periphery of the anchor pile; foundation support is provided for anti-floating through cooperation of the anchor pile and the clamping jaw assembly, when the anchor pile penetrates through the first anti-floating plate, the second anti-floating plate, the third anti-floating plate and the anti-floating pipe, the limiting jaws of the clamping jaw assembly are unfolded under the action of the spring pieces, so that the anchor pile can abut against the anti-floating plates and the lantern rings when moving upwards, the upward moving tendency of a basement due to buoyancy is hindered, and the anti-floating effect of the basement is improved. And through a multi-direction force constraint mechanism, the problem of loosening possibly caused by single-direction stress of the anchor pile is effectively solved, and the anti-floating reliability is further improved.

The present invention relates to a floatable breathing device. The floatable breathing device provides includes a head unit, a snorkel, a plurality of receiving passageways, and an internal pathway. The head unit has buoyant properties and includes an ornamental shaped buoyant outer material and an inner shell positioned within the buoyant outer material. The inner shell forms a head receiving section and a protruding section. The head receiving section is received internal to the buoyant outer material and is configured to be contoured to a human head, the protruding section extending from the head receiving section to a vent opening in the outer buoyant material. The snorkel is connected to and extending through the head unit, while the plurality of receiving passageways are disposed about the inner shell and receiving the snorkel such that the snorkel extends through and exits a portion of the head unit at the vent opening. The internal pathway is positioned along a base of the outer buoyant material and extends between the internal shell and the buoyant outer material, passing to the interior of the interior shell through a cutout in a protruding portion thereof and terminating adjacent to the vent opening.

The present invention relates to an auxiliary recovery system and recovery method for underwater rocket-powered vehicles, belonging to the technical field of underwater vehicle marine test recovery. The system includes a jettisoning mechanism for separating a jettisonable nose section from a recovery position-indicating section to jettison the jettisonable nose section, a parachute ejection device for ejecting a parachute inside the system out of the recovery position-indicating section to open the parachute, a smoke generator for emitting smoke for easy identification, a satellite position-indicating device for locating the rocket-powered vehicle's position at sea, a sensor assembly for acquiring the water depth, speed, and attitude information of the rocket-powered vehicle and transmitting it to a control module, and a recovery control module for issuing corresponding instructions to the jettisoning mechanism, the parachute ejection device, the smoke generator, and the satellite position-indicating device based on information fed back by the sensor assembly. Based on this system, rapid recovery of a negatively buoyant underwater rocket-powered vehicle with a speed exceeding 80 knots can be achieved with high recovery reliability.

The water-air amphibious rescue unmanned aerial vehicle comprises a foam outer ring, a flight control cabin, a middle cabin, an underwater motor and an air power part, the foam outer ring is made of hard foam, is light in weight, large in floating force, reasonable in structural design, small in space needing to be sealed and stable in water movement, a part facilitating grabbing is arranged on the rear portion of the foam, and grabbing is facilitated; and the rescued person can be brought to the shore by controlling the underwater motor. In the emergency rescue process, the unmanned aerial vehicle has the advantages of being stable in flight, high in flight efficiency, high in speed, not prone to being influenced by water conditions and the like, rescuers do not need to enter water, and rescue efficiency and reliability are improved.

The utility model belongs to the technical field of hydraulic engineering equipment, and particularly relates to a water delivery pipeline mud-blocking sand-blocking water-passing anti-floating device which comprises a main body frame, a sand-blocking net, a filtering net and a supporting rod, the main body frame is arranged on the outer wall of a water delivery pipeline in a sleeved mode, and the sand-blocking net is welded to the end of the main body frame and used for blocking large-particle silt and floating objects; the reinforcing frames are distributed in a shape like a Chinese character'mi ', water flow impact force is dispersed through a cross supporting structure, the deformation resistance of the device is enhanced, and the sand blocking net is protected; the filter screen is arranged on the inner side of the sand blocking screen to intercept fine particles layer by layer, so that the pollutant intercepting capacity is improved; the supporting rods are obliquely and vertically installed to form a multidirectional stress system, and the device is effectively prevented from floating in combination with a ballasting area at the bottom of the water conveying pipeline. Through layered filtration, mechanical dispersion and modular design, the technical problems that in the prior art, the interception efficiency is low, the structure is prone to damage, maintenance is difficult, and the buoyancy resistance is insufficient are solved, and the device has the remarkable advantages of being high in interception efficiency, stable in structure, convenient to maintain, high in adaptability and the like.

The application discloses an underwater detection device and belongs to the technical field of underwater detectors. The underwater detection device comprises a sealed cabin body, side floats arranged symmetrically on both sides of the sealed cabin body, an upper float arranged on the top of the sealed cabin body and a support installed on the bottom of the sealed cabin body. A power supply and a multi-parameter detector are arranged in the sealed cabin body. A water depth detector is installed on the upper surface of the upper float. A lift propeller providing vertical propelling force is installed on the side float. An oblique propeller is installed on the support. The upper float provides top buoyancy, and the side float provides two-side buoyancy, so that the center of gravity of the sealed cabin body is deviated downward, thereby the underwater detection device can keep a positive floating attitude to the maximum extent in water, and the effect of resisting rolling and pitching is improved. Through the synergistic effect of the lift propeller and the oblique propeller, the underwater detection device has multi-degree-of-freedom attitude adjustment function, and the operation efficiency and the obstacle passing rate are improved.

The utility model relates to the technical field of anti-floating structures, and provides an anti-floating structure for basement reinforcement, which comprises an anti-floating anchor rod, a plurality of groups of fixing rings are sleeved on the anti-floating anchor rod, and every two adjacent fixing rings are arranged at intervals; a permeation plate is arranged at the top of the anti-floating anchor rod, a plurality of permeation holes are formed in the permeation plate, and a fixing anchor head is arranged at the bottom of the anti-floating anchor rod. Through the arrangement of the anti-floating anchor rod, a user can bear certain buoyancy through the anti-floating anchor rod when the water level is within a normal range, the anti-floating stability of the device is improved, after the water level exceeds the normal range, the user can drain water and relieve pressure through the permeation plate, the user can relieve hydrostatic pressure of a basement, and the water level is protected. The drainage and pressure relief capacity of the device is improved, the stability of the anti-floating anchor rod can be enhanced through the multiple sets of fixing rings, the device can better bear buoyancy, and the anti-floating performance of the device is improved.

Fishing lures including a front body, a middle body, an aft body, a first wing, and a second wing. The front body has an aerodynamic and hydrodynamic profile and is positively buoyant in water. The front body extends along a longitudinal axis from a first end to a second end and extends along a lateral axis from a first lateral side to a second lateral side. The middle body extends along the longitudinal axis from a third end proximate the second end to a fourth end. The aft body is coupled to the middle body proximate the fourth end and defines a hook opening. The hook opening receives a hook projecting beyond an outer surface of the aft body. The first wing and the second wing are coupled to the front body and disposed on the first lateral side and the second lateral side, respectively.

A fishing lure is provided and comprises a line connector (2) arranged to receive a fishing line such that when the lure is being retrieved via said fishing line a forward motion is generated; a buoyancy element (3) generating an upward motion when the lure is fully submerged; a diving guide (4) shaped to generate a downward motion in response to the forward motion; an ascension guide (5) shaped to generate a backward motion in response to the upward motion; a lure body having an elongated shape defining a longitudinal direction, wherein the line connector (2) and diving guide (4) are arranged a front portion (7) of the lure body, and wherein the ascension guide (5) is arranged at a rear portion (8) of the lure body wherein the lure body comprises a passage (11) having a front opening (12) located at the front portion (7) of the lure body and a rear opening (13) located at the rear portion (8) of the lure body, wherein the diving guide is arranged to direct fluid into the front opening (12) in response to a forward motion and wherein the ascension guide (5) is arranged to direct fluid into the rear opening (13) in response to the upward motion.

The application discloses an anti-floating anchor rod structure for an existing building and a construction method thereof. The anti-floating anchor rod structure for the existing building is characterized by comprising a grouting anchor rod, an anchoring plate and a locking structure. The grouting anchor rod is a steel pipe, one open end of the grouting anchor rod is a grouting opening, the pipe wall of the steel pipe is provided with a grouting hole and a grout inlet hole, and the pipe wall of the steel pipe is fixedly connected with a special-shaped structure. The anchoring plate is provided with a through hole at a central position, the grouting anchor rod passes through the through hole, and the axis of the through hole is coincident with the axis of the grouting anchor rod. The application organically combines grouting reinforcement and the anti-floating anchor rod, utilizes the self weight of the geological structure itself to resist the buoyancy generated by the underground water, reversely realizes the thickening of the waterproof bottom plate by utilizing the grouting reinforcement, provides structural support for the application of the anchor rod prestress, and can be widely applied to the anti-floating and anti-seepage treatment of various underground structures, and can improve the anti-floating capacity of the existing building and reduce the underground water seepage risk.

The invention discloses efficient underwater mechanical rock breaking construction equipment, and relates to the technical field of rock breaking. The device specifically comprises a cavity shell, an end cover is fixed to the end of one side of the cavity shell through bolts, a rock breaking assembly used for breaking rock is arranged on the other side of the end cover, a propelling assembly is arranged on the outer wall of the cavity shell, and at least two air flotation assemblies located on the front side and the rear side correspondingly are arranged on the outer wall of the cavity shell; and at least three groups of air floatation assemblies are arranged in an equidistant circular array. According to the underwater rock breaking device, by arranging the multiple air floating assemblies and the multiple propellers, underwater advancing and steering of the whole device can be achieved through water suction and drainage actions and buoyancy changes of the air floating assemblies, and therefore compared with traditional vertical hoisting type breaking, the underwater rock breaking device is more flexible in underwater rock breaking, and the rock breaking efficiency is improved. And the propulsive force generated by the propeller enables the rock breaking assembly to have certain contact pressure during rock breaking, so that the rock breaking effect is improved.

(DE) The present invention relates to a transport drone with a main body having a wing at its upper part and a transport compartment at its lower part, through which a transport object, for example a car, can be inserted and removed forwards and backwards; and a buoyancy element with several tubes connected to the lower part of the main body and which are inflatable and deflatable by means of air pressure. In this configuration, the tubes, which expand and contract by means of air pressure, are connected along the lower perimeter of the main body. By means of the sequential expansion and contraction of the tubes, the drone can not only land on the water surface by means of the buoyancy force, but also, if it tips over on the water surface, hover above the water surface by means of the sequential expansion and contraction of the tubes, thus preventing it from falling into the water.

Underwater wing device for diving to compensate for the natural buoyancy of the diver and their equipment. The invention relates to a device that generates force in the water using the speed produced by the user. It consists of a wing section extruded over a span adapted to generate sufficient force to compensate for the user's buoyancy, thus avoiding the use of weights, which are cumbersome, potentially dangerous, and polluting. The device according to the invention is particularly intended for freediving or diving with a breathing apparatus, underwater tourism, water sports, and as a swimming aid. Figure 1.

The invention relates to a NMR spectrometer (10) comprising a permanent magnet arrangement (11) which comprises a measurement volume (12) and a bore (13) for introducing a NMR measurement sample in a sample cuvette (14) and a HF coil (15) outside a cylindrical temperature regulation tube (16) which comprises a continuous annular gap (17) through which a temperature regulation gas can be conducted through a gas inlet (18), characterized in that on the end opposite to the gas inlet a movable holding device (19) is mounted which in a first operating position does not touch the sample cuvette, in a second operating position holds the sample cuvette force-locked and / or form-locked on the outer circumference of the sample cuvette with an axially acting force or static friction F f in its measurement position and in a third operating position releases the sample cuvette for removal and in the second operating position applies F f >F Stau -F Gewicht , wherein F Stau denotes the buoyancy force generated by the dynamic pressure of the temperature regulation gas flowing onto the sample cuvette and F Gewicht denotes the gravitational force of the sample cuvette. By this it is possible to avoid the problems of the known generic arrangement by the dynamic pressure of the temperature regulation gas.