CN113447233B - Adjustable heat source test equipment for building heat supply and accumulated snow coupling experiment - Google Patents
Adjustable heat source test equipment for building heat supply and accumulated snow coupling experiment Download PDFInfo
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- CN113447233B CN113447233B CN202110727868.1A CN202110727868A CN113447233B CN 113447233 B CN113447233 B CN 113447233B CN 202110727868 A CN202110727868 A CN 202110727868A CN 113447233 B CN113447233 B CN 113447233B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses adjustable heat source test equipment for building heat supply and accumulated snow coupling experiments, and belongs to the field of building snow loads. The adjustable heat source test equipment comprises a servo monitoring system and a main control system, wherein the main control system is connected with the servo monitoring system in a bidirectional way, and is used for receiving temperature monitoring data of the servo monitoring system in real time and sending a heating instruction to the servo monitoring system; and the servo monitoring system is used for sending temperature monitoring data to the master control system in real time and receiving a command of the master control system to heat the simulated building. The device can be used for researching the snow accumulation of the roof, considers the thermal snow melting mechanism of building heating heat conduction, and provides reliable experimental data for deeply developing the research and standard revision of the snow load of the roof with the large-span space structure and the design of the large-span roof.
Description
Technical Field
The invention relates to adjustable heat source test equipment for building heat supply and snow accumulation coupling experiments, and belongs to the field of building snow loads.
Background
Global extreme low temperature ice and snow disasters frequently occur, collapse accidents of buildings and structures caused by snow accumulation are increased continuously, and the snow resistance form of the building structure is very severe. Taking our country as an example, statistics are reported that in 2015, 11 months and in the middle of our country, big snow is generally fallen, and many provinces have snow to cause house collapse accidents, so that more than one thousand houses are damaged; in 1 month of 2018, the house collapses in more than 400 rooms and is damaged in more than 1900 rooms due to two large snow in the middle. Similar accidents are also frequent in japan, usa, canada, norway, etc. In engineering disasters caused by nearly hundreds of snow, which occur from 2008, at home and abroad, large-span space structures (25% of net rack reticulated shells and 18% of space trusses), steel cantilever structures, light steel structures and other structural types sensitive to snow load are more. The large-span space structure has the characteristics of light roof structure, large roof area and large proportion of snow load to total load, is usually controlled by the snow load, and belongs to a structure sensitive to the snow load. On the other hand, the large-span space structure is mostly applied to public buildings such as stadiums, airport terminals, railway stations, and the like, which are very dense in personnel and have a great influence, so that the engineering disaster result caused by snow of the large-span space structure is very serious, and the design method for correctly mastering the roof snow load is of great significance.
A large number of post-disaster investigation results show that: the understanding of the accumulation mechanism and the change rule of the roof snow is unclear, and particularly the understanding of the whole process mechanism of accumulation-ablation-crystallization-accumulation evolution of the roof snow under the influence of environmental factors such as wind, rain, heat and the like is almost blank and becomes the most fundamental reason of disasters. Therefore, only by comprehensively mastering the mechanism of accumulated snow on the roof, the roof snow load can be comprehensively known and correctly designed, and the safety and reliability of the structure are ensured from the source. At present, there are three methods for snow load research, which are field actual measurement, wind tunnel test and numerical simulation. The field measurement is limited by climate and measurement conditions, so that the work progress is slow, and basic data is very deficient. The numerical simulation is low in cost and short in design period, but lacks support of actual measurement and experimental data and a unified standard. At present, wind tunnel tests are the main means for studying snow load by Chinese and foreign students, but when the existing wind tunnels (traditional wind tunnel, french JV meteorological wind tunnel, japan New village CES wind tunnel, harbin Daxue combined test system and the like) are applied for tests, the problems of some simulation of roof snow mechanism, especially incomplete simulation of influence of building indoor heating system on roof snow exist. The problem radically influences the research on the snow load of the large-span space structure roof, so that a novel test device for building heat supply and snow accumulation coupling experiments needs to be developed urgently, and reliable data support is provided for the research.
Disclosure of Invention
The invention aims to provide adjustable heat source test equipment for a building heat supply and accumulated snow coupling experiment, and aims to solve the problem that the influence of an existing wind tunnel on a building indoor heating system on the accumulated snow on a roof is not completely simulated.
An adjustable heat source test device for building heat supply and accumulated snow coupling experiments, which comprises a servo monitoring system and a main control system, wherein the main control system is connected with the servo monitoring system in a bidirectional way,
the main control system is used for receiving the temperature monitoring data of the servo monitoring system in real time and issuing a heating instruction to the servo monitoring system;
and the servo monitoring system is used for sending temperature monitoring data to the master control system in real time and receiving a command of the master control system to heat the simulated building.
Furthermore, the servo monitoring system comprises a rotary table, a temperature sensor and a heater, the middle of the rotary table is vertically communicated, and the temperature sensor and the heater are both arranged at the center of the rotary table.
Further, the turntable comprises an upper rotary table top, a lower rotary table top and a rotary support, the upper rotary table top and the lower rotary table top are fixedly connected to the upper end and the lower end of the rotary support respectively through screws, and the lower rotary table top is provided with a rack.
Furthermore, the turntable further comprises a driving mechanism, the driving mechanism is controlled by the main control system and comprises a motor, a large gear and a small gear, a rotor of the motor is fixedly connected with the small gear, the small gear is meshed with the large gear, and the large gear is meshed with the lower rotary table top.
Furthermore, the diameters of the upper rotary table top and the lower rotary table top are both 1.5m.
The invention has the following advantages:
1. the test equipment fully considers the snow melting and recrystallization processes caused by a heat source of building heating. The method provides important support for the simulation research of the whole process of accumulated snow accumulation-ablation-crystallization-accumulation evolution of the large-span spatial structure roof.
2. Through the regulation to test piece heating device and carousel, the intensity size of control heat source for the experimental result more approaches real snow melt process.
3. The high-precision multi-task monitoring and control system is used for measuring the temperature inside and on the surface of the building in real time, the remote control and parameter monitoring functions of the system are realized, accidents are avoided, and faults are eliminated in time.
Drawings
FIG. 1 is a schematic view of the overall structure of a wind tunnel with an adjustable heat source test device for building heat supply and snow accumulation coupling experiments according to the invention;
FIG. 2 is a schematic system diagram of an adjustable heat source testing device for building heat supply and accumulated snow coupling experiments according to the present invention;
fig. 3 is a schematic structural diagram of the turntable.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2, the invention provides an adjustable heat source test device for building heat supply and accumulated snow coupling experiments, the adjustable heat source test device comprises a servo monitoring system and a main control system, the main control system is connected with the servo monitoring system in a bidirectional way, wherein,
the main control system is used for receiving the temperature monitoring data of the servo monitoring system in real time and issuing a heating instruction to the servo monitoring system;
and the servo monitoring system is used for sending temperature monitoring data to the master control system in real time and receiving a command of the master control system to heat the simulated building.
Further, referring to fig. 1 and 3, the servo monitoring system includes a turntable, a temperature sensor and a heater, the middle of the turntable is vertically through, and the temperature sensor and the heater are both installed at the center of the turntable.
Specifically, the thermal power of the heater: 500-1200W/m 2 Is uniform and continuously adjustable; the diameter of the rotary disc is 1.5m.
Further, referring to fig. 1 and 3, the turntable includes an upper rotary table top, a lower rotary table top and a rotary support, the upper rotary table top and the lower rotary table top are respectively and fixedly connected to the upper end and the lower end of the rotary support through screws, and the lower rotary table top is provided with a rack.
Further, referring to fig. 1 and 3, the turntable further includes a driving mechanism, the driving mechanism is controlled by the main control system, and includes a motor, a gearwheel and a pinion, a rotor of the motor is fixedly connected with the pinion, the pinion is meshed with the gearwheel, and the gearwheel is meshed with the lower rotary table top.
Furthermore, the diameters of the upper rotary table top and the lower rotary table top are both 1.5m.
Specifically, in the building heating simulation system, a heating device is arranged at the lower part of a model turntable to heat the interior of the model and simulate an actual building heating device. The test section mainly comprises a turntable device and consists of a turntable with the diameter of 1.5m, an upper rotary table surface, a lower rotary table surface, a rotary support and a turntable driving device. The disc with the diameter of 1.5m adopts a fan-shaped splicing structure form and is fixed on the upper rotary table top through a connecting screw; the upper rotary table top is formed by welding steel plates, is positioned with the rotary support through a straight opening, is connected with the outer ring of the rotary support through a screw, is driven to rotate by a motor driving device, and drives the wall surface rotary table to rotate through the meshing of the small gear and the large gear. The electric heating device is placed in a reserved space in the middle of the rotary table to heat the test piece.
The above embodiment is only used for helping understanding the method of the present invention and the core idea thereof, and a person skilled in the art can also make several modifications and amendments on the detailed implementation and application scope according to the idea of the present invention, and these modifications and amendments should also be regarded as the protection scope of the present invention.
Claims (3)
1. An adjustable heat source test device for building heat supply and accumulated snow coupling experiments is characterized in that the adjustable heat source test device comprises a servo monitoring system and a master control system, and is characterized in that the master control system and the servo monitoring system are connected in a bidirectional manner, wherein,
the main control system is used for receiving the temperature monitoring data of the servo monitoring system in real time and issuing a heating instruction to the servo monitoring system;
the servo monitoring system is used for sending temperature monitoring data to the main control system in real time and receiving commands of the main control system to heat the simulated building,
the servo monitoring system comprises a rotary table, a temperature sensor and a heater, the middle part of the rotary table is communicated up and down, and the temperature sensor and the heater are both arranged at the center of the rotary table;
the turntable comprises an upper rotary table top, a lower rotary table top and a rotary support, the upper rotary table top and the lower rotary table top are fixedly connected to the upper end and the lower end of the rotary support respectively through screws, and the lower rotary table top is provided with a rack.
2. The adjustable heat source test equipment for building heat supply and snow accumulation coupling experiments of claim 1, wherein the turntable further comprises a driving mechanism, the driving mechanism is controlled by the master control system and comprises a motor, a gearwheel and a pinion, a rotor of the motor is fixedly connected with the pinion, the pinion is meshed with the gearwheel, and the gearwheel is meshed with a lower rotary table top.
3. The adjustable heat source test equipment for building heat supply and accumulated snow coupling experiments as claimed in claim 2, wherein the diameters of the upper rotary table top and the lower rotary table top are both 1.5m.
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