Constraint type water rocket flow control nozzle

Abstract

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.

Description

Technical Field

[0001] The utility model relates to the field of water rockets, and particularly relates to a constrained water rocket flow control nozzle. Background Art

[0002] A water rocket is a device that injects high-pressure gas into a rocket body filled with a part of water and controls the water to be ejected at high speed from the nozzle, so that the water rocket obtains an upward reaction force and flies into the sky. In some specific applications, when the water rocket takes off with a glider or during the demonstration of science and technology activity teaching aids, it is required that the water rocket accelerates smoothly to avoid releasing the water vapor stored in the rocket body too quickly. Usually, to achieve the function of smooth acceleration of the water rocket, it can only be achieved by replacing nozzles with different diameters. However, there are few nozzle diameters available on the market currently, and it is difficult for individuals to manufacture nozzles with different diameters that can be used under high pressure by themselves. Generally speaking, there is currently a lack of a water rocket nozzle that can allow users to adjust the nozzle diameter by themselves and limit the acceleration of the water rocket. Content of the Utility Model

[0003] The purpose of the utility model is to provide a constrained water rocket flow control nozzle aiming at the deficiencies of the prior art, so as to realize the function of stepless adjustment of the water rocket nozzle diameter.

[0004] To achieve the above function, the technical solution adopted by the utility model is as follows:

[0005] A constrained water rocket flow control nozzle includes a pressure bottle, and also includes a flow-limiting nozzle and a constrained nozzle; the flow-limiting nozzle consists of an internal thread interface, a middle shaft with a hollow interior, and a flow-limiting sheet. The outer circle of the right side of the middle shaft is provided with an external thread, and the right end face of the middle shaft is fixedly connected to the flow-limiting sheet; the constrained nozzle is composed of two hollow shafts. The bottom of the inner cavity of the left hollow shaft is provided with a constrained internal thread, and the cavity of the right hollow shaft near the end of the constrained internal thread is a conical constraint cavity; the internal thread interface is threadedly connected to the bottle mouth of the pressure bottle; the external thread interface of the flow-limiting nozzle is threadedly connected to the constrained internal thread of the constrained nozzle; the outer diameter of the flow-limiting sheet is smaller than the inner diameter of the left end of the conical constraint cavity of the constrained nozzle and larger than the inner diameter of the right end of the conical constraint cavity.

[0006] Preferably, the outer diameter of the middle shaft of the flow-limiting nozzle is slightly smaller than the inner diameter of the left hollow shaft of the constrained nozzle; an arc groove is also provided on the outer circular surface of the middle shaft, and a sealing ring is installed in the arc groove; the sealing ring fills the gap between the middle shaft and the inner diameter of the left hollow shaft of the constrained nozzle.

[0007] Preferably, a threaded through hole is provided on the left hollow shaft of the constrained nozzle, and a limit nut is installed in the threaded through hole. The end of the limit nut can lock the right stepped shaft of the flow-limiting nozzle.

[0008] Preferably, the flow-limiting sheet is composed of multiple serrated arc-shaped sheets, and can be deformed and gathered inward under the extrusion of the inner wall of the conical constraint cavity.

[0009] Preferably, a fixing groove is provided on the outer circle of the hollow shaft on the right side of the constraint nozzle, and the fixing groove can be locked by a conventional water rocket launch pad.

[0010] The beneficial effects of the present utility model are as follows:

[0011] Thread the external thread of the flow-limiting nozzle with the internal constraint thread of the constraint nozzle. By changing the length of the thread fit, the tapered constraint cavity can be utilized to varying degrees to press and deform the flow-limiting piece, changing the flow channel size when water flows through the constraint nozzle, achieving the functions of controlling the nozzle flow rate and limiting the acceleration. Description of the Drawings

[0012] Figure 1 is a cross-sectional view of the present utility model;

[0013] Figure 2 is an exploded view of the present utility model;

[0014] Figure 3 is a structural schematic diagram of the present utility model

[0015] In the figure, 1, pressure bottle; 2, flow-limiting nozzle; 3, constraint nozzle; 4, limit nut; 5, sealing ring; 201, internal thread interface; 202, intermediate shaft; 203, external thread; 204, flow-limiting piece; 301, constraint internal thread; 302, tapered constraint cavity; 303, fixing groove. Specific Embodiment

[0016] Next, the embodiments of the present utility model will be described in detail with reference to the accompanying drawings in the embodiments of the present utility model. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0017] As Figure 1 , 2 , shown in 3, a constraint type water rocket flow control nozzle includes a pressure bottle 1, a flow-limiting nozzle 2 and a constraint nozzle 3. The flow-limiting nozzle 2 is composed of an internal thread interface 201, an intermediate shaft 202 with a hollow interior and a flow-limiting piece 204. The outer circle of the right side of the intermediate shaft is provided with an external thread 203, and the right end face of the intermediate shaft is fixedly connected to the flow-limiting piece 204. The constraint nozzle 3 is composed of two hollow shafts. The bottom of the inner cavity of the left hollow shaft is provided with a constraint internal thread 301, and the cavity at one end of the right hollow shaft close to the constraint internal thread 301 is a tapered constraint cavity 302.

[0018] The internal thread interface 201 of the flow-limiting nozzle 2 is threadedly connected to the threaded mouth of the pressure bottle 1, fixing the flow-limiting nozzle 2 to the pressure bottle 1. The external thread 203 of the flow-limiting nozzle 2 is threadedly connected to the constrained internal thread 301 of the constrained nozzle 3; the outer diameter of the flow-limiting piece 204 is smaller than the inner diameter of the left end of the conical constrained cavity 302 of the constrained nozzle 3 and larger than the inner diameter of the right end of the conical constrained cavity 302. The flow-limiting piece 204 is composed of multiple serrated arc pieces and can deform and gather inward under the extrusion of the inner wall of the conical constrained cavity 302. After the constrained nozzle 3 is screwed into the flow-limiting nozzle 2, as the screwing depth increases, the flow-limiting piece 204 is extruded and deformed by the conical constrained cavity 302, and the flow-limiting piece 204 gradually blocks the flow channel of the constrained nozzle 3, which can reduce the water vapor flow rate in the pressure bottle 1 and achieve the purpose of limiting acceleration. When it is necessary to increase the water vapor flow rate, just reduce the screwing depth of the constrained nozzle 3 into the flow-limiting nozzle 2 to make the flow-limiting piece 204 return to its original state and increase the flow channel of the constrained nozzle 3.

[0019] The outer diameter of the middle shaft 202 of the flow-limiting nozzle 2 is slightly smaller than the inner diameter of the left hollow shaft of the constrained nozzle 3; an arc groove is also provided on the outer circular surface of the middle shaft 202 of the flow-limiting nozzle 2, and a sealing ring 5 is installed in the arc groove. The sealing ring 5 fills the gap between the middle shaft 202 and the inner diameter of the left hollow shaft of the constrained nozzle 3 to prevent water vapor from overflowing from the gap during the pressurization process of the pressure bottle 1.

[0020] A threaded through-hole is provided on the left hollow shaft of the constrained nozzle 3, and a limit nut 4 is installed in the threaded through-hole. The end of the limit nut 4 can lock the middle shaft 202 of the flow-limiting nozzle 2 to prevent the positions of the flow-limiting nozzle 2 and the constrained nozzle 3 from changing.

[0021] A fixing groove 303 is provided on the outer circle of the right hollow shaft of the constrained nozzle 3. The fixing groove 303 can be locked by a conventional water rocket launch pad and can be adapted to conventional water rocket launchers on the market.

[0022] When this device is in use, first thread the flow-limiting nozzle 2 to the pressure bottle 1. Then, by adjusting the screwing depth of the constrained nozzle 3 into the flow-limiting nozzle 2, the flow channel size of the constrained nozzle 3 can be steplessly adjusted to control the acceleration of the water rocket.

Claims

1. A constraint type water rocket flow control nozzle, comprising a pressure bottle (1), characterized in that It also includes a flow-limiting nozzle (2) and a constraint nozzle (3); the flow-limiting nozzle (2) is composed of an internal thread interface (201), a hollow intermediate shaft (202) and a flow-limiting sheet (204), an external thread (203) is provided on the outer circle of the right side of the intermediate shaft (202), and the right end face of the intermediate shaft (202) is fixedly connected to the flow-limiting sheet (204); the constraint nozzle (3) consists of two hollow shafts, a constraint internal thread (301) is provided at the bottom of the inner cavity of the left hollow shaft, and the cavity at one end of the right hollow shaft close to the constraint internal thread (301) is a conical constraint cavity (302); the internal thread interface (201) is threadedly connected to the mouth of the pressure bottle (1); the external thread (203) of the flow-limiting nozzle (2) is threadedly connected to the constraint internal thread (301) of the constraint nozzle (3); the outer diameter of the flow-limiting sheet (204) is smaller than the inner diameter of the left end of the conical constraint cavity (302) of the constraint nozzle (3) and larger than the inner diameter of the right end of the conical constraint cavity (302).

2. The flow control nozzle of a constrained water rocket according to claim 1, wherein: The outer diameter of the intermediate shaft (202) is slightly smaller than the inner diameter of the left hollow shaft of the constraint nozzle (3); an arc groove is also provided on the outer circumferential surface of the intermediate shaft (202), and a sealing ring (5) is installed in the arc groove; the sealing ring (5) fills the gap between the intermediate shaft (202) and the inner diameter of the left hollow shaft of the constraint nozzle (3).

3. The flow control nozzle of a constrained water rocket according to claim 1, characterized in that: A threaded through hole is provided on the left hollow shaft of the constraint nozzle (3), and a limit nut (4) is installed in the threaded through hole, and the end of the limit nut (4) can lock the intermediate shaft (202) of the flow-limiting nozzle (2).

4. A constrained water rocket flow control nozzle according to claim 1, characterized in that: The flow-limiting sheet (204) is composed of multiple serrated arc-shaped sheets and can be deformed and gathered inward under the extrusion of the inner wall of the conical constraint cavity (302).

5. The flow control nozzle of a constrained water rocket according to claim 1, characterized in that: A fixing groove (303) is provided on the outer circle of the right hollow shaft of the constraint nozzle (3), and the fixing groove (303) can be locked by a conventional water rocket launch pad.

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