44 results about "Water rocket" patented technology

A water rocket delayed separation device comprises an upper connector, the upper connector is connected with a superior water rocket body, a breather pipe penetrates through the upper connector, extends downwards and penetrates through a lower connector, the lower connector is connected with a subordinate water rocket body, the breather pipe is sleeved with a separation hose, and a one-way air valve is arranged at the lower end of the separation hose. A gas storage pipe is arranged outside the separation hose in a sleeving mode, a gas hole is formed in the lower end of the gas storage pipe, the gas storage pipe plays a role in buffering release of other pressure by arranging the gas storage pipe, the gas hole is formed in the gas storage pipe, and therefore the effect of delayed separation can be started, and control over delayed separation time is also achieved by controlling the hole diameter of the gas hole; the device is simple in structure, light in weight and high in separation success rate.

The invention provides a two-stage rocket automatic separation device based on the gravity-inertial reference system equivalence principle. The two-stage rocket automatic separation device comprises a first-stage rocket body, a second-stage rocket body, a sealing device and a separation device. The sealing device is characterized in that the sealing device is fixed at bottle openings of the first-stage rocket body and the second-stage rocket body, and pressure is injected into the rocket bodies through a one-way air valve of the sealing device. The first-stage rocket body can be launched after the constraint of the sealing device is relieved; the counter-acting force sprayed out of the internal liquid provides the thrust for the whole rocket body to rise. For the second-stage rocket body, the sealing device is fixed to the rocket body through the buckle component of the separating device. Before launching, due to the fact that the second-stage rocket body has certain weight, a spring component at the bottom of the separating device is in a compressed state, and the separating device cannot be triggered. Within a period of time after launching, the lift force of the first-stage rocket body is transmitted to the second-stage rocket body through a spring at the bottom of the separation device, and the spring is still in a compressed state. And until the lift force of the first-stage rocket body is smaller than the elastic force of the spring, the separating device can be started to relieve the constraint on the sealing device of the second-stage rocket body, so that the launching of the second-stage rocket body is realized. The two-stage rocket body independent pressurization mode is adopted, traditional hose connection is not needed, and other user-defined parts are allowed to be added between the two stages of rocket bodies. The water rocket mode that counter-acting force is provided through liquid pressurization is not depended on, and the water rocket can be suitable for launching of various types of rockets. The device is simple in structure, convenient to operate, environment-friendly, safe and stable.

The utility model discloses a constraint type water rocket flow control nozzle which comprises a pressure bottle, a flow limiting nozzle and a constraint nozzle body. The flow-limiting nozzle is composed of an internal thread connector, a middle shaft and a flow-limiting piece, external threads are arranged on the outer circle of the right side of the middle shaft, and the right end face of the middle shaft is fixedly connected with the flow-limiting piece. The restraining nozzle is composed of two hollow shafts, restraining internal threads are arranged at the bottom of an inner cavity of the left hollow shaft, and a cavity, close to one end of the restraining internal threads, of the right hollow shaft is a conical restraining cavity. The internal thread connector is in threaded connection with a bottle opening of the pressure bottle; the external thread of the flow limiting nozzle is in threaded connection with the constraint internal thread of the constraint nozzle; the outer diameter of the flow limiting piece is smaller than the inner diameter of the left end of the conical restraining cavity of the restraining nozzle and larger than the inner diameter of the right end of the conical restraining cavity. When the device is used, the size of a flow channel of the constraint nozzle can be steplessly adjusted only by adjusting the depth of the constraint nozzle screwed into the flow limiting nozzle, the acceleration of the water rocket is controlled, and the device has the advantages of being simple in structure and convenient to operate.

The utility model relates to an integrally-formed water rocket launcher base which is provided with a base main plate, a first connecting table protruding upwards is formed on the base main plate, a pair of pivot joint seats opposite to each other in a spaced mode is formed at the upper end of the first connecting table, a pair of coaxial pivot joint holes are formed in the pivot joint seats, and the pivot joint holes are communicated with the first connecting table. The water rocket launcher is assembled through screw and nut connection; second connecting tables protruding upwards are formed at the edges of a set of opposite sides of the base main board respectively, and U-shaped clamping grooves are formed in the two ends of each second connecting table respectively; three hollowed-out parts are further formed in the base main plate, and an assembling accessory of the water rocket launcher is formed in each hollowed-out part. By means of the structure, when the emitter base is integrally formed, another three emitter spare and accessory parts can be formed at the same time, and therefore the number of molds needed by production of the whole emitter is reduced, and production cost is greatly reduced; spare and accessory parts of the emitter and the base can be stacked, so that the occupied space is reduced, and the packaging and transportation cost is reduced.

The utility model relates to a quick connector for a multistage water rocket bottle body capable of being provided with an air separator, which comprises an integrally formed connector body, the connector body is divided into two sections which are communicated in a penetrating manner along the axial direction, one section is a straight-through quick plug connector shell, the other section is a bottle mouth connector, and the air separator is arranged on the bottle mouth connector. A sealing rubber ring, a limiting clamp spring and an annular end cover are installed in the straight-through quick-plug connector shell, and an external thread and a positioning convex ring are formed on the outer portion of the bottle opening connector. The length of the straight-through quick-plug connector shell is equal to that of the bottle opening connector. When the quick connector is used for connecting the spliced water rocket bottle body and the air separator, each stage of rocket body can be connected by only one bottle body, so that the bottle body and the air separator can be quickly assembled, the efficiency is improved, and convenience is brought to a user.

1. The name of the design product: double-head bottle assembly (water rocket). 2. The use of the design product: multi-stage bottle for teaching model water rocket. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: combined state Figure 1. 5. The assembly 2 pitch view rotated 90 degrees is the same as the assembly 2 left view, omitting the assembly 2 pitch view; the assembly 2 right view is the same as the assembly 2 left view, omitting the assembly 2 right view. 6. Other circumstances that need to be explained Assembly Explanation: Assembly 1 is a double-head bottle, and Assembly 2 is a connecting head. 7. Other circumstances that need to be explained Other Explanation: This product can be connected by N Assembly 2 and N+1 Assembly 1 in turn, and combined state Figure 1 is 1 Assembly 2 and 2 Assembly 1 connected in turn, combined state 2 is 2 Assembly 2 and 3 Assembly 1 connected in turn, and so on.

The utility model relates to an extension spray pipe for a water rocket and the water rocket, the extension spray pipe comprises a hollow spray pipe, one end of the hollow spray pipe is provided with an internal thread interface which is in butt joint with a bottle opening at the bottom of a water rocket body, and the other end of the hollow spray pipe is provided with a clamping flange which is connected with a water rocket launcher. And a parachute device is mounted on the extended spray pipe. After the scheme is adopted, the extension spray pipe is additionally arranged below the bottle opening of the water rocket body, the path is longer when water or gas in the water rocket is sprayed in the linear direction where the axis of the extension spray pipe is located, and therefore the directionality of water rocket launching can be better, and the whole water rocket can obtain a better launching effect; the extension spray pipe provides a better and more convenient installation part for the parachute device, the current situation that a traditional water rocket parachute can only be installed on the head of a water rocket is changed, the installation structure of the parachute and the structure of a water rocket body are simplified, and the flying effect of the water rocket cannot be affected when the parachute is installed on the lower portion.

1. Name of this design product: Teaching model (water rocket mobile launching device). 2. Purpose of this design product: to be used as a teaching model for studying the principles of rocket flight and launch processes. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the design points: use the status reference diagram.

The utility model discloses a rocker type water rocket launching device, which adopts a pure mechanical structure in which a rotating shaft is matched with a rocker, omits an electric control link, can realize vertical launching of a multi-stage water rocket through manual operation, and is simple in structure, convenient to operate and more suitable for being widely used in teaching demonstration.

The utility model relates to the technical field of water rocket experimental equipment, in particular to a water rocket altimeter, which comprises a power supply module, an attitude data acquisition module, a data transmission module, a remote control receiving module and an electromagnetic lock driving module, the power supply module is electrically connected with the attitude data acquisition module, the data transmission module, the remote control receiving module and the electromagnetic lock driving module, the attitude data acquisition module is in communication connection with the data transmission module, and the remote control receiving module is in signal connection with the electromagnetic lock driving module through a signal line. A remote control signal is received through the GLX433RX module, a macro relay HFD / 3 is triggered through an S8050 triode, and an SX1308 boosting chip is matched to drive an electromagnetic lock to achieve 0.1-second top-speed parachute opening. The ten-axis sensor and the full-duplex module form closed-loop control to adjust the parachute opening time in real time; the shunt power supply ensures stable operation of strong current and weak current, the RS485 serial port and 433MHz wireless anti-interference design ensures accurate execution of instructions, and the improvement of high performance and reliability of the water rocket altimeter is realized.

The utility model provides a water rocket with a self-inflating wing. The water rocket comprises a water storage cabin section, a high-pressure medium storage and release cabin section, a primary and secondary separation cabin section, a flight control system cabin section and an inflating wing cabin section, one end of the high-pressure medium storage and release cabin section is fixedly connected with one end of the water storage cabin section; one end of the primary and secondary separation cabin section is connected with the other end of the high-pressure medium storage and release cabin section; one end of the flight control system cabin section is fixedly connected with the other end of the primary and secondary separation cabin section; one end of the inflatable wing cabin section is fixedly connected with the other end of the flight control system cabin section; the inflatable wing cabin section is provided with an inflatable wing device, the inflatable wing device can be inflated in the water rocket recovery process to form an inflatable wing, and the inflatable wing is unfolded towards the outer side of the inflatable wing cabin section; according to the scheme provided by the utility model, the inflatable wings are formed by designing inflation, and the drop point position is accurately controlled through the flight control system, so that the application range of the water rocket is expanded, and the stability of the horizontal recovery system of the water rocket can be improved.

The application relates to a water rocket structure for vertical autonomous recovery, which comprises a head cone part, an attitude control part coaxially connected with the head cone part, a water storage main body part coaxially connected with the attitude control part, a main nozzle part connected with the water storage main body part, a control unit and an altimeter; the control unit is arranged in the head cone part; the altimeter is arranged at the bottom of the water storage main body part; an electrical circuit pipeline is connected between the head cone part, the attitude control part and the main nozzle part, and the control unit is connected with the attitude control part, the main nozzle part and the altimeter through the electrical circuit pipeline; a water supply pipeline is connected between the attitude control part and the main nozzle part. The water rocket is safe and reliable, the test condition construction is simple, and the test data is reliable.

The utility model discloses a traction type water rocket launching device, which adopts a pure mechanical structure combining a rotary pedal and a brake cable, omits an electric control link, can realize vertical launching of a multi-stage water rocket through manual operation, and is simple in structure, convenient and fast to operate and more suitable for being widely used in teaching demonstration.

The utility model provides a water rocket launching pad convenient for physics teaching, which comprises a base and an overturning platform, the overturning platform is provided with a quick joint for connecting a water rocket, and a movable outer ring sleeved on the quick joint; one end of the first wire core is connected with the movable outer ring and can pull the movable outer ring to axially move along the quick connector; one end of the second wire core is connected with the overturning platform, and the pulling force of the second wire core on the wire coil can enable the overturning platform to rotate around the first direction; one end of the tension spring is connected with the turnover platform, the other end of the tension spring is connected with the base, and the tension applied to the turnover platform by the tension spring can enable the turnover platform to rotate around the second direction. The water rocket is controlled to launch through the first wire core, meanwhile, the posture of the overturning platform is controlled through the second wire core, on the premise that an operator keeps a safe distance from the water rocket, the control structure is simplified, the pitching angle of the overturning platform is conveniently controlled, and meanwhile the water rocket can be conveniently overturned. And the motion relation among the structures of the water rocket launching pad can be displayed for young students.

The present invention relates to a triple-redundancy parachute chamber device for parachute opening and recovery of a water rocket, comprising: a parachute chamber body (1), a parachute chamber door (2) installed on the parachute chamber body (1) and capable of being opened and closed, a parachute (3) connected to the parachute chamber door (2), an air pressure control switch (4) and a timing servo (5); the parachute chamber body (1) is provided with an ejection assembly (1a) for ejecting the parachute (3); the air pressure control switch (4) and the timing servo (5) are simultaneously connected to the parachute chamber door (2) for controlling the opening and closing of the parachute chamber door (2); when the parachute chamber door (2) is closed, the parachute (3) can be folded between the parachute chamber body (1) and the parachute chamber door (2); when the parachute chamber door (2) is opened, the ejection assembly (1a) ejects the parachute (3). The parachute opening redundancy of the present invention is high, and the success rate of parachute opening can be effectively improved.

The invention relates to a lateral inflatable water rocket launcher suitable for a rocket body with a nozzle, which comprises an integrally formed launcher main body, the launcher main body is provided with a transverse platform, and a hollow cylindrical nozzle butt joint part in which the nozzle of the rocket body is internally inserted is upwards formed in the middle of the upper surface of the transverse platform; an air inflation part is further formed on one side wall of the transverse platform in a protruding mode, and an air inflation channel communicated with the interior of the nozzle butt joint part is formed in the air inflation part and the interior of the transverse platform; a pair of vertical side walls are upwards formed on the two sides of the transverse platform, and the vertical side walls are higher than the nozzle butt joint part; the launcher main body can be used for launching a water rocket body with a nozzle, after a common bottle body is connected with the nozzle, butt joint is achieved through sealing of the nozzle and the sealing ring and the nozzle butt joint part, and therefore the launcher is matched with launching of the water rocket with the nozzle; in addition, the nozzles with different nozzle inner diameters can be replaced, and emission effects such as different emission speeds and durations are correspondingly obtained.

A separating device for a water rocket comprises an upper connector, the upper connector is connected with an upper-stage water rocket body, a breather pipe penetrates through the upper connector, extends downwards and penetrates through a lower connector, the lower connector is connected with a lower-stage water rocket body, the breather pipe is sleeved with a separating hose, and a second one-way air valve is arranged at the lower end of the separating hose. The separation hose is sleeved with an air storage pipe, air holes are formed in the pipe wall of the air storage pipe, and a first one-way air valve is arranged at the lower end of the air storage pipe. The gas storage pipe is arranged, the gas holes are formed in the gas storage pipe, the gas storage pipe has a buffering effect on pressure release, so that the effect of delayed separation can be started, and the device is simple in structure, light in weight and high in separation success rate.

This utility model discloses an electrolytic water rocket launching game device, comprising: a steel frame with a waterproof anchor bolt fixing seat at the bottom to support the entire device body; within the device body, the operating console includes: a host computer and a start button and a launch button connected to the host computer respectively; the electrolysis system consists of a hand-cranked generator and a transparent electrolytic cell; the positive and negative terminals of the hand-cranked generator are located in the two tubes of the transparent electrolytic cell respectively; the host computer controls the circuit switching of the hand-cranked generator; the gas drive mechanism consists of a gas collection chamber, a pressure relief valve, and a piezoelectric igniter; the pressure relief valve is installed on one side wall of the gas collection chamber and connected to the host computer; the piezoelectric igniter is installed on the other side wall of the gas collection chamber and connected to the host computer; the top of the gas collection chamber abuts against the bottom of the rocket model; the rocket model is located in a vertical glass pipe. This device integrates the complex electrolysis, gas collection, and ignition processes into a single operating console, simplifying operation, enhancing interaction, and providing structural stability and high durability.

The utility model relates to the technical field of teaching aids and toys, in particular to a remote control type water rocket, which is characterized in that when the water rocket is assembled in a pressurized state, the upper end of a sealing one-way inflating valve is sealed with the lower end of a bottle opening, and an annular clamping groove in the middle section of the bottle opening is matched, clamped and fixed with the outer side of a sliding steel ball; the remote controller controls the inner sleeve to move upwards relative to the outer sleeve, and the annular clamping groove in the middle section of the bottle opening is separated from the steel ball. According to the automatic rapid locking structure of the outer sleeve and the inner sleeve in the technical scheme, when a water rocket needs to be assembled in a pressurized state, only the round bottle opening of the water rocket body needs to be pressed downwards into the inner sleeve, a pressure pump (air cylinder) is directly utilized to pressurize the water storage bottle body through the sealing one-way inflation valve, and when launching is prepared, the water storage bottle body is pressed downwards through the sealing one-way inflation valve. An operator is far away from the water rocket, the remote controller is used for moving the inner sleeve upwards relative to the outer sleeve, and therefore locking is quickly relieved, and the situation that air pressure is released outwards, and hurt is caused to a launcher is avoided.

The application belongs to the field of water rocket testing, and particularly relates to a water rocket testing system and method, which comprises a power source assembly, a thrust device, a support and a connecting pipe. The power source assembly comprises a sealed cylinder and an inflator connected with each other, and the sealed cylinder is provided with a water injection mechanism. The thrust device is arranged on the support, and the support is further provided with a sensor for monitoring the state of the thrust device. One end of the connecting pipe is connected in a cavity of the thrust device, and the other end extends into the bottom of the sealed cylinder. The testing system provided by the application can realize long-time stable pressure or variable pressure thrust experiment of the thrust device, and the pressure and water quantity in the cavity will not sharply decrease when the nozzle is opened as in the conventional thrust device, thereby the power parameters of the thrust device can be observed and studied for a long time, the influence of the flowmeter on the thrust is excluded during the thrust experiment of the thrust device, the mass flow and other related parameters can be measured with high precision, and data support is provided for scientific research, so that the related model can be better corrected.

The invention provides a water-carrying fire-fighting rocket and a water-carrying fire-fighting rocket attitude control method, and relates to the technical field of civil fire-fighting rockets, and the method comprises the steps: inputting a launching position, a fire point, a fire area, a gradient, a wind direction and a wind speed into a flight path simulation system, obtaining a rocket launching angle and an ignition lead length, and sequentially igniting an ignition lead and a booster rocket, the water injection nozzle, the explosion package and the ignition lead are all located at the bottom of the main water-carrying rocket, after the main water-carrying rocket and the booster rocket reach a fire area, the explosion package is ignited, the water injection nozzle is opened through explosion, and fire-fighting dispersed water is sprayed to a fire scene. The technical problem that in the prior art, traditional fire fighting equipment is poor in throwing effect in a complex environment due to poor thrust stability can be solved, lift force is provided for a rocket through tension, data are input according to site conditions, the rocket launching angle and the ignition lead length are accurately calculated, and the fire fighting effect is improved. The technical effect of improving the putting accuracy is achieved.

The utility model relates to a time-adjustable air separator for a multi-stage water rocket, which comprises a first pipe body and a hose, and the inner diameter of the hose is smaller than the outer diameter of the first pipe body so as to form expanded connection when the first pipe body is inserted into the hose; the upper end opening of the hose is provided with a radial flange which is arranged outwards, and the lower surface of the radial flange of the hose is further provided with a sealing groove and a connecting convex ring and is connected with a second pipe body; a pressure relief hole is formed in the pipe wall of the second pipe body; the bottom of the hose is provided with a connecting through hole and a first one-way valve; and the bottom of the second pipe body is provided with a mounting hole communicated with the interior and a second one-way valve. The time-adjustable air separator can be used for quickly inflating a multi-stage rocket body and adjusting the separation time of the rocket body, so that the launching operation efficiency can be improved, a self-provided sealing structure and a simplified product structure are realized through the radial flange, the sealing groove and the like which are formed by the hose, and the assembling time and the material cost are saved.

The utility model relates to a water rocket launcher capable of being inflated laterally, which comprises an integrally formed launcher main body, the launcher main body is provided with a hollow rocket body inserting pipe, and a radial platform protruding in the radial direction is formed at the bottom of the rocket body inserting pipe; an air inflation part is further formed on one side of the radial platform in a protruding mode, and an air inflation channel communicated with the inside of the arrow body inserting pipe is formed in the air inflation part and the radial platform. The transmitter further comprises a transmitter base, the transmitter base is provided with a base main board, three hollowed-out parts are further formed in the base main board, and lock catch releasing parts, first inserting strips and second inserting strips are formed in the hollowed-out parts respectively. According to the utility model, the emitter main body is integrally provided with the lateral inflation part and the built-in inflation channel, so that inflation operation can be carried out from the lateral direction; when the emitter base is integrally formed, another three emitter spare and accessory parts, namely the first inserting strip, the second inserting strip and the lock catch releasing part, can be formed at the same time, so that the number of molds required by production of the whole emitter is reduced.

The utility model discloses a low-recoil fire extinguishing bomb launched by unmanned aerial vehicle mounting, which comprises a bomb body, an unmanned carrier, a propulsion assembly and a launch canister, and the unmanned carrier is provided with an unmanned carrier body and a hanger for mounting the bomb body; the front end of the propelling assembly is connected with the projectile body, a water storage box is arranged in the propelling assembly, and a cavity capable of containing a water bag is formed in the water storage box; the launching cylinder is arranged outside the projectile body and the propelling assembly. According to the utility model, the acting force between the projectile body and the launching cylinder is reduced by adopting a mode of boosting the projectile body to launch by the water rocket, so that the acting force between the projectile body and the launching bracket during launching is reduced, and the problem that the overturning force of the projectile body on the unmanned vehicle during launching is large is solved; the water bag is arranged in the propelling assembly, so that the temperature of high-temperature and high-pressure gas sprayed out when the projectile body is launched is reduced, the launching safety of the projectile body is improved, and the fire extinguishing effect is improved.

The invention discloses an anti-unmanned aerial vehicle water rocket and a guidance method, and relates to the technical field of guidance, and the anti-unmanned aerial vehicle water rocket is characterized by comprising an unmanned aerial vehicle defense station and an anti-unmanned aerial vehicle water rocket; the unmanned aerial vehicle defense station comprises a base, the base is fixedly connected with a dry ice pill storage tank, the dry ice pill storage tank is fixedly connected with a group of dry ice conveying channels, each dry ice conveying channel is fixedly communicated with a water rocket launching cylinder, and an anti-unmanned aerial vehicle water rocket is matched with the water rocket launching cylinder; the dry ice pill storage tank is fixedly connected with the laser designator, and the laser designator is fixedly connected with the multispectral comprehensive photoelectric unmanned aerial vehicle detection system; the anti-unmanned aerial vehicle water rocket comprises a water rocket cavity, the water rocket cavity is fixedly connected with an LED beacon and a net gun device, a dry ice chamber is fixedly connected into the water rocket cavity, a fragile film is arranged on the lower side of the dry ice chamber, and saturated salt water is contained in the water rocket cavity. The technical problem to be solved by the invention is to provide the anti-unmanned-aerial-vehicle water rocket and the guidance method, so that anti-unmanned-aerial-vehicle water rocket guidance is facilitated.

The present invention relates to a large-capacity split-type water rocket parachute bay, wherein: the bay has a bullet-shaped bay body, which is formed by a first shell body and a second shell body that can be opened and closed and docked; a connecting portion connected to the top of the water rocket body is formed at the center of the bottom surface of the bay body; a surrounding rubber band is connected to the bottom of the side wall of the first shell body; a mounting recess recessed toward the inside of the shell body is also formed in the middle of the second shell body, and a rubber band connection and release device is provided in the mounting recess, which can be connected to the movable end of the surrounding rubber band and release the movable end of the surrounding rubber band when appropriate. After the bay of the present invention adopts the above structure, the bay body is opened in a side-opening or split-opening manner, and its opening area after opening is maximized, and the internal space of the bay body is completely exposed, and the loads in the bay body, including parachutes, can be opened smoothly, and there will be no situation where the parachute cannot be opened.

This utility model relates to the field of water rocket landing chamber technology and discloses a water rocket parachute chamber, including a water rocket body. A disc is provided on the top of the water rocket body, and a through mounting hole is opened on the disc. The disc is fitted onto the top of the water rocket body through the mounting hole. A through threading hole is opened on the disc. A ring is fixedly connected to the disc. Solid cylinders A and B are symmetrically fixedly connected to the outer circumference of the disc ring. Through the design of the blocking column, the tilting driving force can be strengthened and the separation efficiency can be improved. That is, when the elastic band A is released and a rapid rebound occurs, the rebound force acts on the blocking column to generate an impact force. This impact force directly exacerbates the tilting of the parachute chamber towards the solid cylinder A. The above-mentioned actively enhanced tilting trend allows the parachute chamber cover to detach from the main body more quickly and thoroughly, avoiding separation jamming caused by insufficient tilting force, and greatly improving the overall separation efficiency of the cover.

This invention belongs to the field of educational demonstration products, specifically relating to a water rocket, a launch system, and a launch method. The water rocket includes a rocket body and a piston. The rocket body has a hollow cavity, and the piston is slidably and sealed within the cavity, dividing the cavity into a secondary cavity and a main cavity. The rocket body is equipped with an inflation nozzle I communicating with the secondary cavity and an inflation nozzle II communicating with the main cavity. A nozzle is also provided at the end of the rocket body away from the secondary cavity. During flight, as the pressure in the main cavity gradually decreases, the pressure in the secondary cavity becomes higher than that in the main cavity, pushing the piston towards the main cavity. This maintains the pressure balance in the main cavity, ensuring stable thrust during flight and partially compensating for the pressure loss in the main cavity, guaranteeing the thrust provided by the main cavity, and further improving the kinetic energy and speed of the water rocket.

The application belongs to the field of teaching demonstration supplies, and particularly relates to a horizontal flight water fire arrow, a launching system and a launching method, wherein the horizontal flight water fire arrow comprises an arrow body and a bend pipe; the arrow body is internally provided with a cavity, and the arrow body is further provided with a gas filling nozzle II and a nozzle which are in communication with the cavity; the bend pipe is arranged in the cavity, one end of the bend pipe is in communication with the nozzle, and the other end is arranged in abutment with the inner side wall of the cavity after being bent. The application can realize small-inclination or horizontal launching and flight of the water fire arrow by arranging the bend pipe, and provides a launching and flight mode which is different from conventional water fire arrows.

The utility model discloses a water rocket parachute opening device which comprises a connecting sleeve head and an outer cover which are arranged between two rocket bodies, the two rocket bodies are connected through a butt joint, the connecting sleeve head is arranged on the butt joint in a sleeved mode, a support used for installing a parachute opening control piece is arranged on the side face of the connecting sleeve head, and the outer cover can surround the rocket bodies to form a parachute containing area. An elastic pull rope is connected to one side of the outer cover, and a mounting hole matched with the parachute opening control piece is formed in the outer cover; the side opening type parachute opening structure is adopted, the parachute bin body is constructed on the basis of an original water rocket, it can be guaranteed that the parachute is smoothly opened, device components are greatly simplified, manufacturing cost is reduced, operation is convenient and fast, and the side opening type parachute opening device is more suitable for being widely used in teaching demonstration.