45results about How to "Small inner diameter" patented technology

The embodiment of the invention discloses a traveling wave tube high-frequency assembly and an assembling method thereof, the traveling wave tube high-frequency assembly comprises a traveling wave tube high-frequency assembly, the high-frequency assembly comprises a composite tube shell and an all-metal slow wave structure arranged in the composite tube shell, the composite tube shell comprises an electron gun welding disc, a pole shoe, a spacer ring and a collector welding disc, and the electron gun welding disc, the pole shoe and the spacer ring are brazed together. The all-metal slow-wave structure is composed of a plurality of radial sub-cavities, and the radial sub-cavities are fixed in the composite tube shell through high-temperature diffusion welding. The high-frequency assembly does not need to use a thin-wall tube shell, is simple to assemble, can reduce the inner diameter of a magnetic system, increases bunching current, and further increases the output power under the condition that the voltage is not changed. The composite tube shell and the all-metal slow wave structure are matched through a circle, and the machining precision error can be 0.08 mm. The multiple radial sub-cavities can be fixed in the composite tube shell only through high-temperature diffusion welding, the technological process is simple, the assembly efficiency and precision are high, and the problem that the matching degree becomes poor due to the fact that welding flux flows into the slow-wave structure is solved.

The invention discloses a smashing device for a lithium battery negative electrode material and an operation method of the smashing device, and relates to the technical field of smashing devices.The smashing device comprises a smashing box, a discharging opening is connected to the bottom of the smashing box in a penetrating mode, a feeding opening is connected to the upper portion of one side of the smashing box in a penetrating mode, and two sets of supporting legs are symmetrically installed on the lower portion of the exterior of the smashing box; meanwhile, a filter plate is fixedly mounted at the upper part in the crushing box, and a circular barrel is fixedly mounted above the filter plate in the crushing box; by means of the air blowing device, air can be blown to materials being crushed, the materials can be turned over under the action of air flow, the materials can make more frequent contact with crushing blades under the action of the air flow in the crushing process, the crushing efficiency of the negative electrode materials can be improved by means of the air flow, and the crushing time is shortened; a certain amount of graphite powder can be generated after the materials are crushed, and the graphite powder can be blown up by airflow and discharged through a ventilation pipe, so that the graphite powder can be conveniently and independently recycled, and the crushing efficiency and practicability are improved.

The utility model discloses a cooling assembly for thread machining of a pen container, which comprises a thread machining mechanism, an outer cover is arranged in the thread machining mechanism, a cooling assembly is arranged on the outer cover, the cooling assembly comprises a cooling seat and an adjusting part, a mounting area is formed in the middle of the adjusting part, the cooling seat is arranged in the mounting area, and a fixing part is arranged on the cooling seat. A threaded hole is formed in the middle of the fixing part, a bolt is arranged in the threaded hole, a through hole is formed in the cooling seat, the adjusting part is arranged in the through hole, and the bolt is rotated to push the adjusting part in the through hole. According to the cooling assembly for thread machining of the pen container, the adjusting part can be extruded by rotating the bolt, so that a hose for conveying cooling liquid is pressed through the adjusting part, the hose is stressed to deform, the inner diameter of the hose is reduced, the drainage speed of the cooling liquid is reduced, and a tapping tool is convenient to cool and lubricate; and the use amount of cooling liquid is saved, and adjustment is convenient.

The invention relates to a sulfur isotope detection device system and method for organic sulfides in natural gas, impurities in the natural gas are removed through a preset chemical trap and a hydrogen sulfide adsorption trap coupled with a heating device for use, and the effective enrichment space of the organic sulfides in a cold trap is prevented from being occupied; two stages of cold traps are adopted, so that organic sulfides can be effectively enriched and detected and analyzed; the sulfur isotope detection device system is high in reliability, high in automation degree and easy to operate, sulfur isotope detection and analysis are carried out by combining a chromatography-stable isotope mass spectrometer, and a new way is provided for researching causes, sources and generation mechanisms of sulfur-containing natural gas.

The utility model discloses a printing and dyeing pre-wetting device which comprises a pre-wetting shell, a cloth inlet and a cloth outlet are formed in the left end and the right end of the pre-wetting shell respectively, cloth roller sets are arranged at the cloth inlet and the cloth outlet respectively, a pre-wetting device body is arranged in the pre-wetting shell, and the pre-wetting device body comprises a pre-wetting roller set, a water filtering assembly, a first water pump and a water return connecting pipe. The pre-wetting shell is designed in a segmented mode and comprises the material cloth cavity and the pre-wetting cavity, the inner diameter of a channel is reduced, water backflow is reduced, the washing effect is enhanced, and the coloring quality is improved. And a reverse osmosis water filter is used, so that the cleanliness of pre-wetting water is ensured. The first water pump is added to accelerate the filtering process and improve the efficiency. Filtered water flows in from the top through the design of the water return connecting pipe, and the pre-wetting effect is improved. The three-way electric control valve and the water replenishing pipe facilitate water replenishing, and continuity and stability of the pre-wetting process are guaranteed.

The present invention relates to a partition welding method, which belongs to the field of welding technology, and includes the following steps: preparing tooling; assembling an outer ring plate, an inner ring plate and blades; a red sleeve positioning sleeve; welding; welding a cover plate; welding a radial steam seal body; heat treatment; removing the cover plate and the positioning sleeve; separating the partition along the center dividing surface; performing surfacing welding on the center dividing surface; post-heat treatment and the like. The present invention welds two semicircular partitions together to obtain a partition with better integrity, avoids error accumulation caused by separate welding, and has a higher matching accuracy after being installed in a steam turbine. The present invention uses a positioning sleeve to position the two semicircular outer ring plate bodies, so that the outer ring plate bodies are tightly spliced ​​together as a whole, with better integrity, and the outer ring plate is not easily deformed during the welding process. When welding the radial steam seal ring, the cover plate is used to completely cover the blade to effectively prevent welding slag from splashing onto the blade surface and causing damage to the blade.

The invention discloses raw material cutting-off equipment for automobile bolt production and machining, and relates to the technical field of automobile bolt production and machining. A cutting-off part is fixedly connected to the top of a workbench, a collecting part is fixedly connected to the inner side of the workbench, and a clamping part comprises a lead screw; the first motor is arranged on the inner side of the workbench, the two ends of the lead screw are rotationally connected with the inner side of the workbench, the clamping components are arranged on the two sides of the top of the workbench, and the side faces of the clamping components are fixedly connected with the workbench. And after the limiting mechanism is adjusted and moved to a proper position on the top of the workbench according to the length, needing to be cut off, of the steel plate, the steel plate is placed on the limiting mechanism, and therefore the steel plate is cut off through the cutting-off component.

The utility model belongs to the technical field of sports equipment, and particularly relates to a basketball stand for basketball training, which comprises a basketball stand, a hollow ball basket is arranged on the basketball stand, an adjusting component is arranged at the inner diameter of the ball basket, the adjusting component comprises an L-shaped block, the L-shaped block is rotatably connected with the ball basket, the inner diameter of the ball basket is reduced through rotation of the L-shaped block, and the adjusting component is arranged on the basketball stand. When the L-shaped blocks are in the initial state, the L-shaped blocks define the inner diameter of the ball basket, the basket can be normally used as a common basket, when difficulty training is needed, the L-shaped blocks rotate towards the inner diameter direction to enable the inner diameter of the ball basket to be reduced, adjustment is convenient, electric control can be carried out, part of the L-shaped blocks extend out of the ball basket, part of the L-shaped blocks are located in the ball basket, and therefore the difficulty training difficulty is greatly improved. And the strength is high, larger impact force can be borne, and the service life of the device is prolonged.

The invention relates to a filter for a vehicle-mounted driving motor system, which comprises a common-mode magnetic ring group, a front noise filtering capacitor bank, a rear noise filtering capacitor bank, a high-voltage copper bar and a support, and is characterized in that the common-mode magnetic ring group is mounted in the support, and the front noise filtering capacitor bank and the rear noise filtering capacitor bank are mounted on one side of the support; the high-voltage copper bar passes through the common-mode magnetic ring group; the common-mode magnetic ring group comprises a primary magnetic core, a secondary magnetic core and a tertiary magnetic core; and the front noise filtering capacitor bank and the rear noise filtering capacitor bank respectively comprise an X capacitor, a Y capacitor and a damping resistor. Compared with the prior art, the system has the advantages that the topological structure has more expansibility, the magnetic cores of the common-mode magnetic ring group are selected according to the requirements of different driving motor systems on electromagnetic compatibility, and the application range is wide; the front noise filtering capacitor bank and the rear noise filtering capacitor bank are integrated into a two-in-one filter plate, so that the problem of ESL (Electronic Security Language) caused by overlong lead terminals is effectively solved; and a shielding cabin is formed by the filter through the shielding cover, so that a space coupling path is cut off, and the like.

This invention discloses a method for forming hollow tubes based on low-shrinkage PEKK to achieve high-fidelity replication of the inner wall, belonging to the field of precision molding technology for high-performance thermoplastic polymers. The method includes the following steps: material selection, melt contact molding, inner wall morphology replication, shrinkage attachment control, rapid cooling and freezing, and demolding to obtain the finished product. This invention, through a series of structures and precise control of material shrinkage behavior, allows the inner wall morphology of the tube to directly replicate the surface of the mandrel. The roughness difference ΔRa between the inner wall of the tube and the surface of the mandrel is ≤0.3μm, truly achieving high-fidelity replication of the inner wall morphology and fundamentally solving the problem of large replication deviations in traditional molding processes.

The invention relates to the technical field of building drainage, and discloses an anti-blocking hidden building drainage pipeline which comprises an embedded mounting box and an elastic pipeline arranged in the embedded mounting box, the top end of the elastic pipeline communicates with a water inlet connector, and the water inlet connector penetrates through the top wall of the embedded mounting box; a plurality of adjusting plates are arranged on the outer side of the elastic pipeline; when impurities block the interior of the elastic pipeline, the multiple adjusting plates can be driven to get close to one another through the adjusting assembly, so that the elastic pipeline is extruded, the inner diameter of the elastic pipeline is reduced, the impurities blocked in the elastic pipeline are compressed, and after compression is carried out for a period of time, the impurities in the elastic pipeline are removed. And then the multiple adjusting plates are driven by the adjusting assembly to be away from each other, so that the inner diameter of the elastic pipeline is increased, a gap is formed between the impurities and the inner wall of the elastic pipeline, then the impurities in the elastic pipeline can be discharged downwards under the action of water flow, and therefore the drainage pipeline is prevented from being blocked.

The invention relates to a compressor split air cylinder, a compressor and an air conditioner. The compressor split air cylinder comprises an air cylinder body and an air cylinder sleeve. A protruding part is arranged on the outer edge of the air cylinder body, blade grooves are formed in the protruding part, and blades are arranged in the blade grooves. The cylinder sleeve is sleeved outside the protruding part, and a leaf spring is arranged in the cylinder sleeve and abuts against the blade; a cavity is formed in the air cylinder sleeve, and when the blade retracts, the outer end of the blade can extend into the cavity in a sliding mode. Compared with the prior art, the inner cavity of the cylinder sleeve barrel is used as a receding space, so that the outer ends of the blades can extend into the cavity in a sliding mode, under the condition that cylinders with the same cylinder diameter are adopted, a cylinder spring hole section can be obviously reduced, the size of the compressor is reduced, the compressor is more easily installed in an air conditioner pipeline, and materials are saved.

The invention provides precision casting equipment for an automobile engine cylinder block, and relates to engine cylinder blocks, the precision casting equipment comprises an upper casting mold and a lower casting mold, the top of the upper casting mold is provided with a pouring end, and a pouring element is fixed to the outer end of the pouring end; the irrigation element comprises an irrigation groove. Through the arranged non-return element, when casting is not needed, the overflow channel on the sliding seat can be arranged in the plugging cavity under the action of the spring, so that the overflow channel is in a plugging state, meanwhile, when casting is conducted, the spring is compressed through downward pressing of the pouring end, and the overflow channel is blocked. The overflow channel on the blocking block is driven to slide into the overflow cavity to be opened, so that material input is achieved, in the input process, the spiral conveying groove is matched, concentrated materials can be dispersed all around, impact force generated during input is reduced, and the conveying efficiency of the materials is improved. And the influence on the actual application precision caused by concentrated long-time impact on a certain part in the mold is avoided.

The utility model provides a motor with a self-locking function and a clothes airing machine. The motor comprises a main body with a rotating shaft 1, a torsion spring 2, a rotating piece 3, a retainer 4 and a sleeve 5, the rotating piece 3 is connected to one end of the rotating shaft 1 of the main body, and a driving groove 31 is formed in the rotating piece 3; the end part of the torsional spring 2 extends into the driving groove 31, and the rest part of the torsional spring 2 is wound on the periphery of the rotating piece 3; the retainer 4 is provided with a connecting part 41 and a retaining part 42, and the retaining part 42 extends into the driving groove 31 and is close to the end part of the torsional spring 2; one end, far away from the rotating piece 3, of the connecting part 41 is connected with a driving piece such as a winding wheel; the sleeve 5 is sleeved on the outer sides of the rotating piece 3 and the torsional spring 2; the motor provided by the utility model has a self-locking function.

The utility model provides a pushing tube, a guide wire and a guide wire system.The pushing tube is of a hollow and slender structure and comprises multiple sections distributed in the length direction of the pushing tube, the multiple sections comprise the pushing section and the detection section, the detection section is connected to the far end of the pushing section, the inner diameter of the detection section is larger than that of the pushing section, the detection section is used for containing a detector, and the detection section is connected to the far end of the pushing section. A detection window is arranged on the side wall of the detection section; the pushing section is provided with a far-end part which extends from the far end to the near end of the pushing section by a preset length, and the far-end part has a reduced outer diameter in the direction towards the far end. Compared with the change of the inner diameter of the pushing pipe, the change of the outer diameter of the pushing pipe has greater influence on the rigidity of the pushing pipe, the required performance of the pushing pipe can be achieved only with less processing amount, and the processing is more convenient.

This disclosure provides a rotor (100) comprising: a fixed rotor (20) including a cylindrical first rotor core (21) and a plurality of first magnets (22) arranged circumferentially thereon, and fixed to a rotating shaft (10); a rotating rotor (30a) including a cylindrical second rotor core (31) and a plurality of second magnets (32) arranged circumferentially thereon, and disposed adjacent to the fixed rotor in the axial direction of the rotating shaft, and mounted on the rotating shaft in a manner rotatable relative to the fixed rotor; and a spacer portion (40a) disposed at a position inside the inner circumferential surface (34) of the second rotor core, and rotating integrally with the rotating shaft, wherein the rotating rotor has a first protrusion (35) on the inner circumferential surface of the second rotor core, and the spacer portion has a second protrusion (45), which abuts against the first protrusion when the rotating rotor rotates relative to the fixed rotor (20) and the first magnets and second magnets face each other with the same polarity. This rotor can reduce the inner diameter of the rotating rotor.

The utility model relates to a high-strength fastening screw with a pressure-bearing structure, which is characterized in that the top of a mounting screw rod is movably sleeved with a bearing nut, the outer side of the bottom of the mounting screw rod is screwed with a transmission screw cylinder through threads, the outer side of the middle of the mounting screw rod is screwed with a fixed screw cylinder through threads, and the top of the mounting screw rod is movably sleeved with a reinforcing mechanism; after the top of the bearing nut is overlarge in pressure provided by the outer side, the bearing nut drives the rotating screw barrel and the sleeving screw barrel to vertically move on the outer side of the mounting screw, and the rotating screw barrel and the sleeving screw barrel are continuously subjected to abutting force abutting against the inner wall of the screw barrel in the downward moving process; further, the inner side walls of the rotating screw cylinder and the sleeving screw cylinder are tightly attached to the outer side wall of the mounting screw rod, the contact friction force of the outer side wall of the mounting screw rod to the inner side walls of the rotating screw cylinder and the sleeving screw cylinder is increased, the bearing nut cannot continuously move at will, and the stability of the whole mounting screw rod in the inserting and using process is improved from the top of the mounting screw rod.

The utility model discloses a 220kV guide rod type casing pipe ascending flanged base, which relates to the technical field of casing pipe ascending flanged bases, and comprises an ascending flanged base, an operation port is arranged on the ascending flanged base, an insulating cylinder is arranged in the ascending flanged base, an opening used for facilitating internal operation is arranged on the insulating cylinder, and the position of the opening corresponds to the position of the operation port. According to the sleeve ascending flanged base, the openable and closable forming insulating cylinder is arranged in the ascending flanged base, so that the inner diameter of the sleeve ascending flanged base is reduced, the steel consumption of the ascending flanged base and the use amount of transformer insulating oil are reduced, the cost is reduced, the insulation margin of the ascending flanged base is improved, and the product safety is also improved; the ascending flanged base with the structure is simple in manufacturing process and convenient to operate.

The diversion tunnel flood discharge structure comprises a diversion tunnel, a flood discharge pipe, a pressurizing pipe and an air compressor, the flood discharge pipe is fixedly arranged, one end of the flood discharge pipe is connected with the water outlet end of the diversion tunnel, the other end of the flood discharge pipe is connected with a river channel, one end of the pressurizing pipe is connected with the flood discharge pipe, and the other end of the pressurizing pipe is connected with the air compressor. The inner diameter of the pressurizing pipe is smaller than that of the flood discharge pipe. The diversion tunnel flood discharge structure is simple in overall structure, high in flood discharge efficiency and low in construction difficulty and cost.

The utility model relates to a mutual -inductor technical field especially a kind of circular table with large current mutual -inductor, including shell, magnetic core and coil, the coil is wound on magnetic core, the magnetic core and coil are set in shell, secondary output wire is provided on the coil, the secondary output wire extends to shell outside, glue sealing is carried out in shell interior, through-hole is set in the middle part of shell, copper bar is threaded in through-hole, primary input copper sheet is welded in the both ends of copper bar. A kind of circular table with large current mutual -inductor obtained by the utility model, copper bar is threaded in shell interior, to ensure the stable passage of large current, while also can reduce the inner diameter of coil, magnetic core, to reduce the size of whole mutual -inductor, reduce cost while miniaturization.

The invention relates to an air pipe for an air pump and belongs to the technical field of pipeline structures. The air pipe for the air pump comprises a pipe body, a connector assembly, a second connector and a first sealing piece. The joint assembly is sleeved at the end part of the pipe body; the second connector is provided with a first end and a second end, the first end is connected with the air nozzle, the second end is rotatably connected with the connector assembly, the second connector is connected to the outer side of the connector assembly in a sleeving mode, and the pipe body is communicated with the air nozzle through the second connector; the first sealing piece is movably arranged on the outer side of the connector assembly in a sleeving mode in the length direction of the connector assembly, and the first sealing piece is used for sealing the connector assembly and the second connector; the interval size between the connector assembly and the inner wall of the second connector is gradually reduced from the side, facing the first end, of the connector assembly to the side, facing the second end, of the connector assembly. According to the air pipe for the air pump, the risk of air leakage at the joint between the air pipe and the air nozzle can be reduced.

The utility model discloses a fire extinguisher bottle group fixing frame capable of preventing tightening deformation, which belongs to the field of fire-fighting equipment and comprises a central connecting shaft, tightening hoop groups, a bottom fixing plate and a reinforcing fixing plate, two or more tightening hoop groups for fixing fire extinguishing agent bottle bodies are arranged on the central connecting shaft at intervals, each tightening hoop group comprises a plurality of tightening hoops, and the bottom fixing plate is fixed on the bottom fixing plate. Triangular supporting plates are arranged on the two sides of a bent edge at the position of an opening in each tightening hoop, a bottom fixing plate is fixed between every two adjacent tightening hoops, the two ends of a reinforcing fixing plate are fixedly connected with the bottom fixing plate and a center connecting shaft respectively and located in the tangent plane of every two adjacent tightening hoops, and all the tightening hoops are fixed to the center connecting shaft. When the tightening hoop tightens and fixes the bottle bodies, the bent edges at the two ends of the steel belt cannot deform and straighten due to increase of tightening force, false tightening cannot be generated due to fluctuation of the tightening force, it can be guaranteed that all the bottle bodies are fixed under different working conditions, and the bottle bodies cannot be loosened under the vibration working condition.

The utility model discloses an internal arteriovenous fistula internal diameter monitoring and protecting device which comprises a controller and a multifunctional cuff, and the controller is composed of a bandage, a hook-and-loop fastener, a plastic shell, a power button, a touch display screen, a charging interface, an air path interface, a circuit interface, a lithium battery, a single-chip microcomputer, an audio output module, a linear motor, a miniature air pump and a miniature electromagnetic valve. The multifunctional oversleeve is composed of an oversleeve body, a hook-and-loop fastener, an air channel connecting pipe, a circuit connecting pipe, an air bag, an MEMS ultrasonic patch, a flexible film temperature sensor and a graphene far infrared patch, and the circuit connecting pipe and the air channel connecting pipe of the multifunctional cuff are connected with a circuit interface and an air channel interface of the controller respectively. The pressure applied to the internal arteriovenous fistula is adjusted by detecting the inner diameter of the internal arteriovenous fistula, and meanwhile, the internal arteriovenous fistula is irradiated by infrared rays, so that the internal arteriovenous fistula can be monitored and maintained for a long time, and the formation of internal arteriovenous fistula aneurysm is prevented and treated.

The invention belongs to the technical field of radial artery haemostat, and particularly relates to an automatic pressure setting radial artery haemostat which comprises an elastic ring, the elastic ring is provided with a notch, an elastic connecting piece is fixedly connected to the notch, and a rubber contact block and a compression block are fixedly installed on the inner diameter wall of the elastic ring to increase friction force. A pressure applying assembly is mounted on the outer diameter wall of the elastic ring, and the pressure applying assembly is matched with the limiting assembly, so that gas pressure can be quickly transmitted into the compression block, and an affected part of a patient can be quickly compressed; meanwhile, the limiting assembly can adjust the pressure on the pressure applying assembly, so that the pressure applying assembly is controlled to reduce the required pressure, automatic pressure relief can be achieved when the affected part swells, and the adverse effect on the body caused by long-time swelling of the affected part is avoided.

This utility model relates to the technical field of conductive connection devices, specifically to a connector and its shielding cover and crimping sleeve. The connector includes a shielding cover and a crimping sleeve. The tail end of the shielding cover has at least one set of spring claws extending outwards from the head of the shielding cover. The crimping sleeve has a contact section and a crimping section for crimping the cable shielding layer. The contact section is fitted onto each of the spring claws in the same set. The side of the spring claws facing away from the center of the area enclosed by the same set of spring claws has a portion that abuts against the inner circumferential surface of the contact section of the crimping sleeve. Because the spring claws of the shielding cover are covered by the crimping sleeve, the gaps between the spring claws are blocked by the crimping sleeve. This allows the crimping sleeve to enclose the same set of spring claws, improving the tightness of the shielding enclosure and reducing the likelihood of electromagnetic leakage at the spring claw gaps affecting the shielding performance.

The utility model relates to the field of material high-temperature treatment equipment, and discloses a heat preservation cylinder and a single crystal furnace, the heat preservation cylinder comprises at least two cylindrical heat preservation layers which are mutually nested inside and outside, and the surface of the heat preservation layer closest to a heater is uniformly coated with a high-temperature-resistant insulating coating. According to the thermal insulation cylinder, the distance between the inner wall of the thermal insulation cylinder and the heater is reduced by arranging the inner thermal insulation layer, and heat loss is reduced, so that energy consumption during single crystal preparation of the single crystal furnace is reduced, and the preparation cost of the single crystal is reduced. Meanwhile, the surface of the closest thermal insulation layer is coated with the high-temperature-resistant insulating coating, so that accidents such as ignition caused by too close distance between the thermal insulation layer and the heater can be avoided, the heater is prevented from being damaged by the ignition phenomenon, and the preparation cost of the single crystal is further reduced.

The utility model discloses a high-temperature-resistant and high-pressure-resistant sealing stop valve, and relates to the technical field of valves. The check valve comprises a valve body, a valve cover is arranged above the middle of the valve body, a valve rod is arranged in the valve cover, and the top end of the valve rod is connected with a hand wheel. A stop plate is arranged in the valve body, a valve clack assembly is arranged at the bottom of the valve rod and comprises a valve clack body rotationally connected with the valve rod, positioning rods are arranged at the four corners of the valve clack body, a sealing assembly is arranged at the upper end of the valve deck and comprises a sealing ring fixed in the upper side wall of the valve deck, and the upper side wall of the sealing ring is in threaded connection with a ring cover. A pressurizing ring is bonded to the inner wall of the sealing ring, and an inner cavity of the sealing ring communicates with the pressurizing ring. According to the utility model, the tightness of connection between the valve cover and the valve rod can be increased through the sealing assembly, the sealing performance between the valve cover and the valve rod is improved, and the valve clack assembly not only ensures that the valve clack body does not move when the valve rod rotates, but also ensures the stability when the valve clack body closes a medium channel.

The invention relates to the technical field of electric water cannon, in particular to a law enforcement water cannon which comprises a cannon body main pipe connected with a flanged elbow, and the flanged elbow is connected with a cannon nozzle. The angle adjusting assembly comprises a horizontal rotation power mechanism and a pitching rotation power mechanism; the inner diameter adjusting assembly is used for adjusting the inner diameter of the gun nozzle; the length adjusting assembly comprises a detection mechanism, a driving mechanism and a telescopic pipe; when the angle of the gun nozzle is adjusted, the inner diameter of the gun nozzle can be adjusted through the inner diameter adjusting assembly, so that the water flow pressure at an outlet of the gun nozzle is controlled, and when the inner diameter is adjusted, the detection mechanism can detect the adjusting position of the inner diameter so as to control the driving mechanism to drive the telescopic pipe to stretch out and draw back; therefore, the inner diameter adjusting assembly and the inner diameter adjusting assembly act together to achieve the technical effect of rapidly adjusting the range.

This invention provides a heat exchange structure, an air conditioner, and a defrosting control method for the outdoor unit of an air conditioner. The heat exchange structure includes: a heat exchange pipe comprising a first pipe, a second pipe, and a third pipe connected in series, wherein the second pipe is located between the first pipe and the third pipe, the inner diameter of the second pipe is smaller than that of the first pipe, and the inner diameter of the second pipe is smaller than that of the third pipe; an air inlet is formed on the side of the first pipe away from the second pipe, and an air outlet is formed on the side of the third pipe away from the second pipe; a heat exchanger disposed in the second pipe; and a fan disposed on the side of the heat exchange pipe near the air inlet and the side of the heat exchange pipe near the air outlet. This invention solves the problems of increased costs due to the need to increase raw materials when improving the heat exchange capacity of the outdoor unit heat exchanger, and the inability of the indoor unit to continue heating during defrosting of the outdoor unit heat exchanger.