86results about How to "Reduce constraints" patented technology

The invention discloses a model fine tuning method and system based on task priority and elastic weight solidification, belongs to the technical field of machine learning, and aims to solve the technical problem of how to provide a stable, efficient and low-power silk screen manufacturing model which can adapt to various complex production scenes. Comprising the following steps: collecting sample data, and dividing the sample data into a plurality of subsets; service weights and priority coefficients of all new tasks in the silk screen manufacturing process are analyzed based on the sorted subsets; constructing a knowledge graph based on the entities and the relationship between the entities; calculating the importance degree of the model parameters to the old task based on the Fisher information matrix, and adjusting the priority level of the model parameters based on the knowledge graph; and on the basis of the Fisher information matrix, updating a loss function of the silk screen manufacturing model under the new task through EWC, and correcting the current silk screen manufacturing model on the basis of entities and relationships in the knowledge graph, so that multi-task model fine tuning is realized.

The invention relates to the field of artificial intelligence chips, in particular to an artificial intelligence chip integrated with an on-chip memory array, a computing task processing method and electronic device.The chip comprises a controller and a plurality of processor-memory modules, obtaining a plurality of sub-calculation tasks; the processor-memory module comprises a processing unit group, a memory and a scheduler, the processing unit group comprises a plurality of processing units, and the processing units process the sub-calculation tasks; the memory stores data related to the plurality of processing units in the processing unit group when executing the corresponding sub-calculation tasks; the scheduler is connected to the plurality of processing units and the memory and is used for scheduling access operation of the plurality of processing units to the memory, the processing unit group is arranged in a processing layer of the artificial intelligence chip, the memory is arranged in a storage layer of the artificial intelligence chip, and the processing unit group is used for processing the processing units. The processing layer and the storage layer are arranged in a stacked mode.

The invention provides an InSAR baseline combination design method and system for four-satellite formation, and belongs to the technical field of radar measurement, and the method comprises the steps: giving formation SAR satellite imaging parameters according to a surveying and mapping scale requirement and an InSAR multi-baseline fusion elevation measurement error requirement, and calculating a satellite vertical baseline initial constraint range; calculating an interference stereo measurement offset fusion standard deviation of each baseline; calculating an interference stereo measurement fusion offset error scaling coefficient and a dimensional conversion coefficient, and further calculating an interference stereo measurement fusion phase standard deviation; constructing a non-fuzzy elevation reconstruction constraint condition; and according to system parameters, solving a baseline combination threshold range in combination with the given constraint condition set to obtain an InSAR baseline design combination of the four-satellite formation. The method is used for design optimization of the formation track.

The invention discloses an optimized operation method for a hydrogen refueling station to participate in a day-ahead market and a balance market. The method comprises the following steps: constructing an upper-layer hydrogen refueling station bidding quotation model; a lower-layer day-ahead market clearing model composed of an electric energy market, a standby market and a hydrogen energy market is established; establishing a lower-layer balance market clearing model based on the bidding quotation of each subject and the reserve capacity provided by each subject of the lower-layer day-ahead market clearing model; constructing a lower-layer overall clearing model based on the middle-lower-layer day-ahead market clearing model and the middle-lower-layer balanced market clearing model; converting the lower-layer overall clearing model into a group of constraint conditions by using a KKT condition, adding the constraint conditions into an upper-layer hydrogen refueling station bidding quotation model, and converting the upper-layer model and the lower-layer model into a single-layer model; and respectively linearizing nonlinear terms of the single-layer model through a strong dual theorem and a big-M method so as to convert the nonlinear terms into a mixed integer programming model and directly solve the mixed integer programming model through a solver. According to the invention, the flexible resource regulation potential of the hydrogen refueling station is fully exploited, the flexibility of market transaction is improved, and the income of the hydrogen refueling station is increased.

The invention discloses a gas molecule insulation strength prediction method and device based on a graph attention neural network, terminal equipment and a storage medium, and the method comprises the steps: obtaining the molecular structure information of a to-be-detected gas molecule, and constructing a molecular structure graph; respectively inputting the molecular structure diagram into a preset first insulation strength prediction model and a preset second insulation strength prediction model to obtain a first insulation strength prediction value and a second insulation strength prediction value; and calculating an average value of the first insulation strength predicted value and the second insulation strength predicted value to obtain an insulation strength predicted value of the to-be-detected gas molecule. Through the implementation of the method, a large number of manual experiments and data analysis based on expert knowledge and expert experience do not need to be carried out on unknown gas molecules in the prediction process of the insulation strength of the unknown gas molecules, the restriction of human resources in the work of predicting the insulation strength of the gas molecules is reduced, and the prediction efficiency is improved. And the accuracy of the insulation strength prediction result is improved.

The present application relates to a skirtless end cap structure and a reverse osmosis membrane element, and relates to the field of reverse osmosis membrane, which includes an end cap, which includes an intermediate ring sleeve, an outer ring sleeve and a plurality of ribs, the intermediate ring sleeve is coaxially arranged with the outer ring sleeve, the ribs are radially extended along the intermediate ring sleeve, each rib is evenly arranged around the circumference of the intermediate ring sleeve, and the two ends of the ribs are respectively fixedly connected to the outer peripheral surface of the intermediate ring sleeve and the inner peripheral surface of the outer ring sleeve; the outer peripheral surface of the outer ring sleeve is provided with at least three axially spaced interlocking grooves, and the axial distance between the surface of the ribs and one end face of the outer ring sleeve is 1-3mm. The present application can reduce the constraints on large-diameter membrane units and reduce the occurrence of glass fiber embedding due to excessive gaps.

The invention discloses a multi-mode multi-degree-of-freedom latticed effect amplification type damping vibration attenuation system, and relates to the technical field of damping vibration attenuation and noise reduction, the multi-mode multi-degree-of-freedom latticed effect amplification type damping vibration attenuation system comprises a plurality of vibration attenuation structures, each vibration attenuation structure comprises a damping layer, and each damping layer comprises a frame body; a plurality of cantilevers and a plurality of torsion connecting arms are arranged in the frame body, wherein the cantilevers are located on the same plane, the free ends of the cantilevers face different directions, and the torsion connecting arms are located on the same plane and face different directions. The free end of the cantilever is provided with a mass section; the torsion connecting arm comprises a middle inertia section, and the two sides of the middle inertia section are connected with the frame body through fixing arms. The two fixed arms are both eccentrically connected with the middle inertia section and located on the two sides of the center of the middle inertia section respectively. And each damping layer is connected with the base body structure through a supporting structure unit. By the adoption of the scheme, through multi-mode / multi-degree-of-freedom vibration and the coupling effect of the multi-mode / multi-degree-of-freedom vibration, structure damping effect amplification and elastic wave regulation and control low and medium frequency efficient vibration reduction are achieved.

The utility model discloses an ecological self -repairing assembled retaining wall, including cast -in -place pad, prefabricated vertical board and prefabricated backboard, the slope of prefabricated vertical board supports prefabricated backboard, prefabricated vertical board bottom is equipped with toe and hind toe, still include prefabricated toe board and post -cast heel board, prefabricated toe board is fixed with cast -in -place pad, the hind part of prefabricated toe board is equipped with a plurality of toe grooves, and the toe of prefabricated vertical board is inserted in toe groove, and post -cast heel board is used for with prefabricated vertical board's bottom and hind toe pouring fixed. Advantages lie in, adopt prefabricated toe board to be used for with prefabricated vertical board bottom toe cooperation preliminary fixed prefabricated vertical board, and then through the pouring of post -cast heel board makes prefabricated vertical board and cast -in -place pad and post -cast heel board form an organic whole, and the overallity is strong and the structure is stable.

The application relates to the technical field of bridge and tunnel construction, in particular to a small-clearance bridge and tunnel combined structure anti-interference construction method. The bridge and tunnel combined structure comprises a bridge and a tunnel arranged in parallel along an axial direction; the tunnel comprises a tunnel vertical excavation section adopting a first slope and a second vertical excavation of a tunnel foundation pit and a tunnel slope excavation section adopting multi-stage slope excavation of a tunnel foundation pit; the bridge comprises a bridge slope excavation section adopting slope excavation of a pile cap foundation pit and a bridge vertical excavation section adopting vertical excavation of a pile cap foundation pit; the anti-interference construction method comprises the following steps: S1, setting the depth of the tunnel foundation pit slope excavation to be greater than the pile cap embedded depth of the bridge slope excavation section; after the tunnel foundation pit is excavated and stabilized, the bridge pile foundation is constructed; S2, after the bridge pile foundation construction is completed, the tunnel main body structure construction and the pile cap construction of the bridge slope excavation section are simultaneously performed; S4, after the tunnel foundation pit backfilling is completed, the construction of the remaining structure of the bridge is performed, the pile cap construction of the bridge slope excavation section is prepositioned, and the construction speed is improved.

The present invention discloses an asymmetric T-shaped support system with few pivot points, including a T-shaped steel member and a parallel connection. The T-shaped steel member is the main load-bearing member of the support system, and is used to transfer the upper load to the lower support pile. The parallel connection is arranged above the T-shaped steel member, and the adjacent T-shaped steel members are connected to form a frame system. The steel column of the T-shaped steel member of the present invention can be reliably connected to the support pile, and is less constrained by the flatness of the ground and the bearing capacity of the foundation. The steel column and the crossbeam are integrally welded, and can be prefabricated in the factory, with good integrity, simple construction process, and short construction period. The adjacent T-shaped steel members are connected as a whole by the parallel connection, which improves the rigidity and stability of the system.

The invention relates to the technical field of railway vehicles, and provides a central traction device, a bogie and a railway vehicle, and the central traction device comprises a traction beam, a pin sleeve, a central pin and a connecting rod. Wherein the traction beam is provided with a mounting channel along the height direction, and the outer surface of the traction beam is provided with a connecting part. The pin sleeve is installed in the installation channel, a pin hole and two free gaps are formed in the pin sleeve in the height direction, and the two free gaps are located on the two sides of the pin sleeve respectively in the width direction of the railway vehicle. The center pin is installed in the pin hole. One end of the connecting rod is connected with the connecting part, and the other end is suitable for being connected to the framework. Redundancy of structural parts of the central traction device can be avoided, and light weight is achieved under the condition that transverse, vertical and longitudinal functions are kept unchanged.

The invention provides an electric dust collector and a suction inlet body, which can stably keep a rotary cleaning body and have few layout restrictions. The suction port body has a motor (11) as a drive source, a rotary cleaning body (12), a transmission part (13), a fixing member (124) as a first magnetic body, and a second magnetic body (133). The transmission unit (13) is disposed coaxially with the rotary cleaning body (12), and transmits the power of the motor (11) to the rotary cleaning body (12) to rotate the rotary cleaning body (12). The fixing member (124) is disposed on the rotary cleaning body (12). The second magnetic body (133) holds the rotary cleaning body (12) at a predetermined position with respect to the transmission part (13) by a magnetic force acting between the second magnetic body (133) and the fixing member (124).

The utility model provides a sleep monitoring pad, which comprises a main body layer, the main body layer is provided with a mounting groove, the mounting groove extends along the length direction of the main body layer, and the mounting groove is arranged close to the first edge of the main body layer; the piezoelectric sensor is arranged in the mounting groove and used for collecting sleep data, and the piezoelectric sensor is arranged to be of a strip-shaped structure extending in the length direction of the main body layer; one end of the first cable is electrically connected to the output end of the piezoelectric sensor, and the other end of the first cable extends out of the edge of the main body layer. According to the method, the sleep data of the user can be collected and analyzed without changing the sleep habit of the user, so that the user experience is improved, and the sleep quality is guaranteed.

The application provides a soil organic carbon estimation method based on a Sentinel-2 image, and steps include sample collection, remote sensing data processing, feature screening, model building, training and testing, and optimal model inversion. The application aims to solve the problems of insufficient precision and interpretability of existing estimation methods, and constructs a high-precision estimation technology system that fuses multispectral data and stacking model algorithms. Only small-scale sample collection is required to train the model, without the need for repeated field sampling and laboratory analysis, which greatly reduces the cost, has small external constraints and is environmentally friendly. The application can efficiently realize large-scale continuous estimation, and the estimation result has high precision and strong stability, which can accurately depict the spatial distribution of carbon content and provide reliable technical support and data guarantee for related work.

The invention relates to the technical field of water conservancy and hydropower construction engineering, and particularly discloses a large-scale branch pipe group hydraulic pressure test supporting device which comprises a pier body, a bearing seat and an elastic traction assembly, the bearing seat is movably arranged on the pier body, and the elastic traction assembly is arranged on the bearing seat. The two bearing seats are oppositely and adjacently arranged to support a branch pipe joint, and the elastic traction assembly is connected with the two bearing seats; when a water pressure test is carried out, the branch pipe joint may generate certain radial deformation under the action of water pressure, the two bearing seats can overcome the traction force of the elastic traction assembly to move towards the two sides under the gravity action of the branch pipe joint, deformation of the branch pipe joint in the radial direction can be adapted, the friction and damage risks of the branch pipe joint are reduced, and the service life of the branch pipe joint is prolonged. Meanwhile, the bearing seat has a certain movement margin, constraint on a welding seam of the branch pipe joint can be reduced, stress distribution can be improved, stress release can be accelerated, and therefore the stability and safety of the branch pipe joint are improved.

The present invention discloses an asymmetric power grid phase-locked synchronization method based on a complex vector filter. Aiming at the challenge that the control bandwidth of the rear-stage single synchronous coordinate system phase-locked loop in the traditional asymmetric power grid phase-locked synchronization technology based on a second-order generalized integrator is limited by the stability margin of the cascade system, the present invention introduces a first-order complex vector filter in a stationary coordinate system as a basic filtering unit, reconstructs the control structure of the front-stage positive and negative sequence filtering network, and adopts a feedback filtering architecture to suppress the control coupling effect of the front-stage filtering network and the rear-stage single synchronous coordinate system phase-locked loop, thereby achieving a significant improvement in the dynamic response capability of the rear-stage single synchronous coordinate system phase-locked loop under the premise of meeting the stability margin, thereby achieving accurate and rapid synchronization of the positive and negative sequence voltage components under asymmetric power grid conditions.

This utility model relates to a box-type ring beam pin joint, comprising a box body with a bracket at the bottom. Several pin plates are installed around the box body, each with a pin hole for mounting a pin. Each pin plate includes a first pin plate, a second pin plate, and two third pin plates. The first pin plate is inserted into the box body, while the second pin plate is installed outside the box body, coaxially aligned with the first pin plate. The two third pin plates are installed on the side of the bracket away from the second pin plate, coaxially aligned with each other. This box-type ring beam pin joint can be applied to the roof structure of large stadiums, enabling better connection between the ring beam and the radial and vertical structures, achieving reliable force transmission and ensuring structural stability.

The invention discloses an air compressor cluster cooperative control and energy efficiency optimization method based on digital twinning, and the method comprises the following steps: collecting the real-time operation data of an air compressor cluster and an air supply system, and carrying out the time alignment, and obtaining the time alignment data; establishing a digital twinborn model of the air compressor cluster air supply system; the method comprises the following steps of: constructing a Zonotop observer to obtain an initialized coupling Zonotop; generating a candidate group control strategy set in the rolling optimization window; a reachable domain propagation operator is called to execute prediction updating, and prediction coupling Zonotop is obtained; consistency shrinkage is executed, and an updated coupling Zonope is obtained; and loading each candidate group control strategy to the digital twinborn model, executing simulation deduction, selecting an optimal control strategy from the candidate group control strategy set, and issuing the optimal control strategy to an air compressor cluster execution control system for execution. The feasibility and the stable energy-saving effect of the air compressor cluster cooperative control strategy are improved.

The utility model provides a connecting structure. The connecting structure comprises a limiting flange, a first stud and a second stud, the first stud and the second stud are connected to the two opposite sides of the limiting flange respectively. A first fastening thread is arranged on the first stud; the second stud is provided with a second fastening thread and a self-tapping thread; the second fastening thread is positioned between the limiting flange and the self-tapping thread; and the pitch of the self-tapping thread is equal to that of the second fastening thread. According to the connecting structure, the self-tapping thread on the second stud of the connecting structure can be tapped on the connecting piece to obtain the internal threaded hole, and then the threaded connection between the second stud and the connecting piece is completed through the second fastening thread and the internal threaded hole, so that the assembling procedures are reduced, the assembling cost is reduced, and the torque performance and the reliability are improved.

The application discloses a panoramic image intrinsic decomposition method based on light pre-extraction and belongs to the technical field of image intrinsic decomposition.The application combines the 360-degree expression of a panoramic image to a scene, saves complex light information onto a pre-extraction image through light pre-extraction, directly uses the pre-extraction image as a constraint condition, can realize accurate positioning of a complex light region, improves the decomposition process through the constraint of the complex light region, reduces highlight and shadow information in a reflectivity image, realizes separation from light properties, introduces the pre-extraction image in the determination of a non-local constraint weight, combines the weight with a KNN result, can effectively select appropriate pixel pairs for constraint, improves the adaptability of constraint between different pixel points in a scene, reduces unnecessary constraint, and improves the image quality obtained through decomposition.The application is suitable for the fields of image decomposition and image processing and improves image processing quality.

The embodiment of the specification provides a loudspeaker, comprising: a housing having an inner cavity; the vibrating diaphragm is arranged in the inner cavity; the driving unit drives the vibrating diaphragm to vibrate; the vibration transmission unit is in transmission connection with the vibrating diaphragm and the driving unit; and a first gap is formed between the edge of the vibrating diaphragm and the inner wall of the shell, so that the vibrating diaphragm is allowed to slide relative to the inner wall of the shell.

The invention discloses an unmanned aerial vehicle visual navigation method based on prior strategy guidance and mask contrast learning, which comprises the following steps of: performing time sequence modeling and feature extraction on an original visual observation image data set by using a mask contrast learning module to obtain a final embedded representation sequence, and performing visual navigation based on the final embedded representation sequence. Training the mask contrast learning module by using a contrast learning method based on a momentum updating mechanism to obtain a trained mask contrast learning module; and performing reinforcement learning training on the prior teacher strategy based on the global state information, and in combination with the trained mask comparison learning module and the prior teacher strategy based on the global state information, obtaining an overall learning target and completing visual navigation of the unmanned aerial vehicle. The method has excellent strategy performance and cross-environment generalization ability in various scenes with sensing interference and irregular obstacle distribution, is suitable for autonomous decision-making tasks of unmanned aerial vehicles and other visual sensing limited systems, and has good theoretical popularization value and engineering application prospect.

The invention discloses a visual perception large model distributed training method based on a general calculation fusion network, and relates to the technical field of information and communication, and the method comprises the steps: an edge server initializes and broadcasts a pre-trained general large model; receiving general large model parameters to form a local general model; the edge device continuously receives visual perception data samples, and online learning is carried out through incremental training and a sliding window mechanism; performing clustering analysis on local sample data, and classifying samples into personalized model processing samples and global model processing samples; respectively inputting the classification samples into the personalized model and the global model, and weighting and aggregating output features through a gating network; the edge device uploads the updated global model parameters to a server for aggregation, and a new global model is generated; and the edge equipment periodically receives the latest global model parameters broadcasted by the server, and iterative training is carried out until the model converges. According to the invention, high-efficiency, high-precision and high-reliability distributed model training and visual perception performance are realized.

A stator coil of a rotating electric machine is formed by a concentric winding method. A stator coil is configured by inserting and connecting hairpin-shaped coil pieces (10, 11, 20, 21, 30, 31) formed from flat wires from one side and the other side in the axial direction. The length of the linear part of the coil piece is half of the axial length of the stator core, a convex shape or a concave shape is formed at the two leg end parts, and the convex part and the concave part are embedded. The coil is composed of three kinds of coil pieces: central coil pieces (10, 11) that connect the slots in the circumferential direction in the vicinity of the radial center of the slots; inner coil pieces (20, 21) that are connected in the circumferential direction so that coil end portions are biased inward in the radial direction than the radial positions of the slots; and outer coil pieces (30, 31) that are connected in the circumferential direction so as to be biased outward in the radial direction. Concentric coil portions formed by connected central coil pieces (10, 11), coil pieces (20, 31), and coil pieces (30, 21) are made to have the same length, so that the resistance values are made to be consistent, and the assemblability is improved.

The utility model relates to hydrogen storage alloy tabletting expansion rate measurement technical field, especially in kind of measure hydrogen storage alloy tabletting expansion rate's device, main including cylindrical jar body, the top of jar body is sealed with high borosilicate glass, the top of high borosilicate glass is arranged with high definition video recording equipment, and the lateral wall of jar body is connected with gas supply pipeline, and the inner chamber bottom of jar body places and places hydrogen storage alloy tabletting of transverse oxygen storage alloy tabletting, the utility model discloses double tabletting horizontal and vertical layout mode, improves hydrogen storage alloy volume expansion calculation precision, makes researcher obtain reliable volume expansion rate data, provides accurate quantitative index for material performance analysis, adopts adhesive fixing method, and hydrogen storage alloy's boundary restraint force action is reduced as far as possible, makes material in the experiment process can expand freely, and the natural state of its in hydrogen pressure environment is truly reflected, adopts dynamic image recording equipment whole process to capture the morphological change of material, and records hydrogen storage alloy expansion change details.

The utility model belongs to the field of electric furnace smelting, especially relates to a double position ladle refining furnace electrode rotating device, including rotating frame, electrode rotating oil jar, rotating oil jar trunnion base, slewing bearing, rotating base, stand hanger, rotating locking device, oil cylinder support, proximity switch arrangement, the inner ring of slewing bearing is fixed in rotating base, the outer ring is connected with rotating frame, electrode rotating oil jar is driven rotating frame around slewing bearing centre axis between 1# work position and 2# work position through piston rod telescopic, the proximity switch arrangement detects the work position of rotating frame and triggers rotating locking device and locks rotating frame, through structural optimization and function cooperation, synchronous realization has been achieved to accurate positioning, stable operation, space saving, life extension and efficiency promotion, and the demand of modernization steel smelting to equipment high performance, low energy consumption, easy maintenance has been satisfied comprehensively.

This invention relates to the field of pipeline monitoring technology, and more particularly to a thickness monitoring device for high-temperature pipelines. The device includes a transducer and a waveguide rod. A clamping fixture is provided between the transducer and the waveguide rod to press the acoustic input end of the waveguide rod tightly against the end face of the transducer. The outer wall of the waveguide rod forms an annular groove through two sets of annular protrusions. The clamping fixture includes an annular ring body detachably mounted on the transducer and a connecting circular plate embedded in the annular groove. Several insertion structures with pre-set circular holes through the connecting circular plate are fixed to the side of the annular ring body away from the transducer. Each insertion structure has a locking nut threaded onto its end protruding from the connecting circular plate. A toothed ring swivel assembly is rotatably fitted onto the surface of the connecting circular plate. This invention not only ensures uniform contact and consistent pre-tightening force between the transducer and the waveguide rod end faces, thereby improving the quality of ultrasonic signal transmission, but also ensures the durability of their tight fit.

The present application relates to the technical field of data processing, and in particular to a method, system, device and storage medium for processing hardware product report data. The present application first obtains and standardizes the original data of hardware products, then receives the classification rules input by the logged-in user, classifies the standardized data, and obtains the classified data; next, the matching template is called from the template library, the structure, style and interactive logic metadata information of the template are extracted, and based on the structure, style and interactive logic metadata information of the template, the classified data is mapped to generate report data by receiving the mapping configuration input by the user, and a personalized visual report is dynamically constructed; the template metadata is combined with the data classification result input by the user, so as to realize the dynamic construction of the report generation process, improve the flexibility and personalization of the report presentation form, and reduce the constraints brought by the template solidification.

The present invention provides an organic thin film that can obtain excellent electron injection and electron transport properties when used as an electron injection layer of an organic EL element; a coating composition that can be used appropriately when manufacturing the organic thin film; and a material for an organic EL element that is a raw material for these organic thin films and coating compositions.

The utility model discloses a multi-stream spiral tube water bath vaporizer suitable for a narrow space, which comprises a cylindrical outer shell, two ends of the cylindrical outer shell are respectively and fixedly connected with end tube plates, the upper end of the end tube plate on one side is provided with a shell pass inlet in a penetrating manner, and the lower end of the end tube plate on one side is provided with a shell pass outlet; an outer spiral winding tube bundle inlet and an inner spiral winding tube bundle inlet are formed in the upper end of the end tube plate on the other side, and an outer spiral winding tube bundle outlet and an inner spiral winding tube bundle outlet are formed in the lower end of the end tube plate on the other side; a center cylinder is arranged in the cylindrical outer shell, and the two ends of the center cylinder are fixedly connected to the end tube plates through center cylinder supporting shafts respectively. An inner spiral winding tube bundle is spirally wound along the outer wall of the central cylinder, an outer spiral winding tube bundle is wound along the periphery of the inner spiral winding tube bundle, and a supporting grating is arranged between the inner spiral winding tube bundle and the outer spiral winding tube bundle; according to the utility model, a plurality of groups of spiral winding tube bundles can be wound in a limited space, so that the space of the shell is greatly optimized, and the installation in a narrow space is realized.