Capsule type piston propellant pressurizing and conveying device

Abstract

The invention discloses a bag type piston propellant pressurizing and conveying device which comprises a propellant storage box and a piston located in the propellant storage box. The screw rod is positioned in the propellant storage box; the left end of the propeller penetrates through the propellant storage box to be connected with the speed reducer, and the right end of the propeller extends towards an outlet of the propellant storage box and is fixed on the inner wall of the propellant storage box through a bearing seat; the lead screw is used for driving the piston to move rightwards. The pressure-bearing sleeve sleeves the periphery of the screw rod, the left end of the pressure-bearing sleeve is fixedly connected with one side of the piston, and the right end of the pressure-bearing sleeve extends towards the direction of the bearing seat; propellant is contained in the storage bag, the storage bag is located on the periphery of the lead screw and located in an inner cavity of the propellant storage box, and the storage bag is used for extruding the propellant in the storage bag out from a storage bag outlet when the piston extrudes the storage bag rightwards, so that the propellant is discharged from the outlet of the propellant storage box; the storage bag is mounted in the propellant storage box, so that the compatibility requirement of the propellant is effectively avoided; and the sealing problem of lead screw transmission extrusion is effectively solved.

Description

Technical Field

[0001] The invention belongs to the field of engine delivery systems, and in particular relates to a capsule-type piston propellant pressurized delivery device. Background Art

[0002] The piston tank is one of the implementation methods of the extrusion type booster delivery system. Due to its simple supply control, high emptying efficiency and long service life, it is widely used in the field of propellant booster delivery. Piston tanks are divided into gas source extrusion and motor screw drive extrusion according to the driving mode. Gas source extrusion mainly connects the high-pressure nitrogen or helium in the gas cylinder to the top of the tank, and uses the high-pressure gas to push the piston to squeeze the propellant into the supply pipeline. The gas source system requires additional high-pressure gas cylinders, delivery pipelines and valve control systems, which greatly increases the overall quality of the engine and the complexity of the system. The motor screw drive extrusion is to drive the motor to drive the screw to rotate, and the circumferential motion is converted into axial motion through the nut, driving the piston to squeeze the propellant to achieve propellant booster delivery. The transmission device has a simple structure and a small system volume, and the piston movement speed can be controlled to achieve precise control of the propellant supply flow. However, there are often sealing problems in piston tanks at present. Not only is it difficult to solve the sealing problem at the threaded fit between the screw and the nut, but the friction generated by the axial movement of the sealing ring on the piston head will greatly increase the motor power demand. Green propellants such as high-concentration hydrogen peroxide that are non-toxic, pollution-free, and easy to store are the future development trend. However, high-concentration hydrogen peroxide has strict requirements on the compatibility of contact materials, which greatly limits the selection of materials used in the pressurized delivery system. Summary of the invention

[0003] The object of the present invention is to provide a capsule piston propellant booster delivery device to solve the problems of difficult sealing at the threaded fitting of the screw rod and the nut, large power of the driving motor and high compatibility requirements of the propellant.

[0004] The present invention adopts the following technical scheme: a capsule piston propellant booster delivery device, comprising:

[0005] The propellant tank is sealed, and a reducer and a drive motor are installed at its left end;

[0006] a piston located in the propellant tank;

[0007] The screw rod is located in the propellant tank; its left end passes through the propellant tank and is connected to the reducer, and its right end extends to the outlet of the propellant tank and is fixed to the inner wall of the propellant tank through a bearing seat; the screw rod is used to drive the piston to move rightward;

[0008] The pressure-bearing sleeve is sleeved on the outer periphery of the screw rod, the left end of which is fixedly connected to one side of the piston, and the right end of which extends toward the bearing seat;

[0009] The storage capsule contains propellant and is located outside the screw rod and in the inner cavity of the propellant storage tank. When the piston presses the storage capsule to the right, the propellant in the storage capsule is squeezed out from the storage capsule outlet, thereby allowing the propellant to be discharged from the outlet of the propellant storage tank.

[0010] Further, the cross section of the inner wall of the propellant tank is elliptical, and the cross section of the outer wall thereof is circular.

[0011] Furthermore, the pressure-bearing sleeve includes, from left to right, a first sleeve, a second sleeve, and a third sleeve which are interlocked in sequence, the right end of the third sleeve is fixed to the left side of the bearing seat, and the left end of the first sleeve is fixed to the right side wall of the piston.

[0012] Furthermore, a propellant outlet is provided at the storage capsule corresponding to the outlet of the propellant tank, so that the propellant is discharged from the propellant outlet of the storage capsule and discharged through the outlet of the propellant tank.

[0013] Furthermore, the right end of the first sleeve is buckled on the outside of the left end of the second sleeve, and the right end of the second sleeve is buckled on the outside of the left end of the third sleeve.

[0014] The beneficial effects of the present invention are:

[0015] The present invention effectively avoids the propellant compatibility requirement by installing the storage bag in the propellant tank and effectively solves the sealing problem of screw drive extrusion;

[0016] The present invention eliminates the seal used for the piston by providing a storage capsule, thereby reducing the friction and resistance caused by the seal, thereby reducing the power of the driving motor; at the same time, the polymer material used in the storage capsule is often first-class compatible with the liquid propellant, which is suitable for long-term storage of the propellant, and the storage capsule isolates the propellant from the structural components, thereby ignoring the propellant compatibility requirement when selecting the structural material;

[0017] The present invention realizes the circumferential limiting capability of the piston through the elliptical inner wall profile of the propellant tank, realizes structural simplification and avoids the risk of the bladder being cut, reduces the commonly used limiting tracks, makes the system composition simpler, meets the circumferential limiting requirements of the screw application, and ensures the smoothness of the propellant tank shell wall surface, which meets the requirements for the use of the bladder;

[0018] The present invention isolates the contact between the screw rod and the storage bag by the pressure-bearing sleeve, so that the screw rod can be installed on the bearing seat, ensuring the smoothness of the contact surface of the storage bag. In the working state, due to the axial pressure of the storage bag on the pressure-bearing sleeve, when the first sleeve moves to the right, the second sleeve and the third sleeve do not move, thereby facilitating the control of the discharge flow of the propellant by controlling the rotation speed of the driving motor; by analogy, when the second sleeve moves to the right, the third sleeve does not move due to the axial pressure, thereby also facilitating the control of the discharge flow of the propellant by controlling the rotation speed of the driving motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Among them: 10, propellant tank; 11, piston; 12, reducer; 13, drive motor; 14, screw rod; 15, pressure sleeve; 16, storage bag; 17, first sleeve; 18, second sleeve; 19, third sleeve. DETAILED DESCRIPTION

[0021] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. The "direction" in the present invention is based on the position of the present invention in a certain direction. Figure 1 Description of the trend in the state.

[0023] The present invention discloses a capsule-type piston propellant pressurizing and conveying device, such as Figure 1 As shown, it includes a propellant tank 10, a piston 11, a screw rod 14, a pressure-bearing sleeve 15, and a storage bag 16.

[0024] The propellant tank 10 is in a sealed state, and a reducer 12 and a drive motor 13 are installed at the left end of the propellant tank 10; the piston 11 is located in the propellant tank 10; the screw rod 14 is located in the propellant tank 10; the left end of the screw rod 14 passes through the propellant tank 10 and is connected to the reducer 12, and the right end of the screw rod 14 extends to the outlet of the propellant tank 10 and is fixed to the inner wall of the propellant tank 10 through a bearing seat; the screw rod 14 is used to drive the piston 11 to move rightward.

[0025] The pressure-bearing sleeve 15 is sleeved on the periphery of the screw rod 14, the left end of the pressure-bearing sleeve 15 is fixedly connected to one side of the piston 11, and the right end of the pressure-bearing sleeve 15 extends toward the direction of the bearing seat; the storage capsule 16 contains propellant, and the storage capsule 16 is located on the periphery of the screw rod 14 and in the inner cavity of the propellant tank 10. The storage capsule 16 is used to squeeze the propellant in the storage capsule 16 out from the outlet of the storage capsule 16 when the piston 11 squeezes the storage capsule 16 to the right, thereby allowing the propellant to be discharged from the outlet of the propellant tank 10.

[0026] The storage capsule 16 is an annular container with a closed structure. The storage capsule 16 is an annular bag made of polytetrafluoroethylene or other polymer materials. The storage capsule 16 stores liquid propellant inside. The propellant outlet of the storage capsule 16 is welded to the outlet joint of the propellant tank 10. The storage capsule 16 is provided with a propellant outlet at the outlet of the propellant tank 10, so that the propellant is discharged from the propellant outlet of the storage capsule 16 and discharged through the outlet of the propellant tank 10.

[0027] The cross section of the inner wall of the propellant tank 10 is elliptical, and the cross section of the outer wall is circular. The inner wall of the propellant tank 10 is elliptical, and the outer wall is circular, so there is no need to use a limiting mechanism to limit the piston 11, ensuring that the piston 11 does not rotate when the screw rod 14 rotates but only moves in the left and right directions; the piston 11 is located in the propellant tank 10 and fits the inner wall profile of the propellant tank 10. The piston 11 is used to provide extrusion force for the storage capsule 16; the screw rod 14 drives the piston 11 to move rightward through the nut.

[0028] When the system is working, the driving motor 13 outputs rotation, which is decelerated by the reducer 12 to drive the screw 14 to rotate, and the piston 11 is driven to move rightward through the screw 14 and the nut to squeeze the storage bag 16, so that the storage bag 16 is continuously squeezed and contracts to discharge the propellant inside it.

[0029] The pressure-bearing sleeve 15 includes, from left to right, a first sleeve 17, a second sleeve 18, and a third sleeve 19 which are interlocked in sequence. The right end of the third sleeve 19 is fixed to the left side of the bearing seat, and the left end of the first sleeve 17 is fixed to the right side wall of the piston 11. The right end of the first sleeve 17 is buckled on the outside of the left end of the second sleeve 18, and the right end of the second sleeve 18 is buckled on the outside of the left end of the third sleeve 19.

[0030] Example 1

[0031] In this embodiment, the inner profile of the propellant tank 10, i.e., the cross section of the inner wall of the propellant tank 10 is: an ellipse with a long semi-axis of 130 mm and a short semi-axis of 125 mm, and the cross section of the outer wall is a circle with a radius of 280 mm. The length of the propellant tank 10 is 757 mm, the material of the storage capsule 16 is polytetrafluoroethylene, the thickness of the storage capsule 16 is 10 mm, and the working pressure of the capsule piston 11 propellant booster delivery device is 5.2 MPa, and the flow rate is 0.8939 kg / s. The pressure-bearing sleeve 15 adopts a three-stage pressure-bearing sleeve 15, and the sleeves are connected by a 3mm boss. At the same time, the inclination and rounded corner structure are designed at the edge of the sleeve to prevent the storage capsule 16 from being damaged by the sharp edge. The outer diameters of the first sleeve 17, the second sleeve 18, and the third sleeve 19 are 94 mm, 78 mm, and 62 mm, respectively.

[0032] Under the premise of ensuring the working pressure of 5.5MPa, the driving force is based on the formula: F=P c πA, F is the driving force required to drive the electric motor, P c is the working pressure of the feed tank, and A is the contact area of ​​the storage bag 16.

[0033] According to the structural design parameters of the piston 11 and the pressure sleeve 15, it is calculated that the driving electric motor needs to generate 2.5×10 5 N thrust. The speed of the piston 11 is based on the formula: Where v is the speed of the piston 11, is the propellant flow rate, and ρ is the hydrogen peroxide density.

[0034] The power required by the driving motor 13 is P=Fv. When pushing the third sleeve 19, the required thrust is 2.37×10 5 N, the maximum moving speed is 0.015 m / s; when pushing the second sleeve 18, the required thrust is 2.48×10 5 N, the maximum moving speed is 0.0143 m / s; when pushing the first sleeve 17, the required thrust is 2.56×10 5 N, the maximum moving speed is 0.0138 m / s; it can be calculated that the maximum power P required by the drive motor 13 is 3555 W.

[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A capsule piston propellant booster delivery device, characterized in that: include: The propellant tank (10) is in a sealed state, and a reducer (12) and a drive motor (13) are installed at the left end thereof; A piston (11) located in the propellant tank (10); A screw rod (14) is located in the propellant tank (10); its left end passes through the propellant tank (10) and is connected to the reducer (12); its right end extends toward the outlet of the propellant tank (10) and is fixed to the inner wall of the propellant tank (10) through a bearing seat; the screw rod (14) is used to drive the piston (11) to move rightward; A pressure-bearing sleeve (15) is sleeved on the outer periphery of the screw rod (14), with its left end fixedly connected to one side of the piston (11) and its right end extending toward the bearing seat; A storage capsule (16) containing a propellant is located outside the screw rod (14) and inside the inner cavity of the propellant storage tank (10), and is used to squeeze the propellant in the storage capsule (16) out from the outlet of the storage capsule (16) when the piston (11) squeezes the storage capsule (16) to the right, thereby allowing the propellant to be discharged from the outlet of the propellant storage tank (10).

2. A capsule piston propellant booster delivery device according to claim 1, characterized in that: The cross section of the inner wall of the propellant tank (10) is elliptical, and the cross section of the outer wall thereof is circular.

3. A capsule piston propellant booster delivery device according to claim 1, characterized in that: The pressure-bearing sleeve (15) comprises, from left to right, a first sleeve (17), a second sleeve (18), and a third sleeve (19) which are interlocked in sequence. The right end of the third sleeve (19) is fixed to the left side of the bearing seat, and the left end of the first sleeve (17) is fixed to the right side wall of the piston (11).

4. The capsule piston propellant booster delivery device according to claim 1, characterized in that: The storage capsule (16) is provided with a propellant outlet at a position corresponding to the outlet of the propellant tank (10), so that the propellant is discharged from the propellant outlet of the storage capsule (16) and discharged through the outlet of the propellant tank (10).

5. The capsule piston propellant booster delivery device according to claim 3, characterized in that: The right end of the first sleeve (17) is buckled on the outside of the left end of the second sleeve (18), and the right end of the second sleeve (18) is buckled on the outside of the left end of the third sleeve (19).

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