A capsule piston propellant pressurized delivery device

Abstract

The application discloses a kind of capsule piston propellant pressurized conveying device, comprising: propellant storage tank, piston, in propellant storage tank;Lead screw, in propellant storage tank;Its left end passes through propellant storage tank and is connected with speed reducer, its right end extends to the outlet of propellant storage tank, and is fixed on the inner wall of propellant storage tank by bearing seat;Lead screw is used to drive piston to move right;Pressure containment sleeve, sleeve is set in the periphery of lead screw, its left end is fixedly connected with one side of piston, and its right end extends to the direction of bearing seat;Storage capsule, propellant is contained in it, is located in the periphery of lead screw, and the inner cavity of propellant storage tank, for when piston extrudes storage capsule right, extruding propellant in storage capsule from storage capsule outlet, to make propellant discharge from the outlet of propellant storage tank;The application installs storage capsule in propellant storage tank, effectively avoids propellant compatibility requirement;Effectively solve the sealing problem of lead screw transmission extrusion.

Description

Technical Field

[0001] This invention belongs to the field of engine delivery systems, and particularly relates to a bladder-type piston propellant pressurization and delivery device. Background Technology

[0002] Piston-type propellant tanks are one type of extrusion-based pressurization and delivery system. Due to their simple supply control, high venting efficiency, and long service life, they are widely used in propellant pressurization and delivery. Piston-type propellant tanks are further divided into gas-source extrusion and motor-driven screw extrusion based on their drive method. Gas-source extrusion mainly uses high-pressure nitrogen or helium gas from a cylinder introduced into the top of the tank, using the high-pressure gas to push the piston to extrude the propellant into the supply pipeline. Gas-source systems require additional high-pressure gas cylinders, delivery pipelines, and valve control systems, significantly increasing the overall weight of the engine and the complexity of the system. Motor-driven screw extrusion uses a motor to drive a screw to rotate, which, through a nut, converts the circumferential motion into axial motion, driving the piston to extrude the propellant and achieve pressurized delivery. The transmission device has a simple structure, a small system size, and allows for precise control of the propellant supply flow rate by controlling the piston speed. However, current piston-type propellant tanks often suffer from sealing problems. This is not only reflected in the difficulty of sealing the threaded connection between the screw and nut, but also in the friction generated by the axial movement of the sealing ring on the piston head, which greatly increases the motor power requirements. High-concentration hydrogen peroxide and other non-toxic, non-polluting, and easily stored green propellants are the future development trend. However, high-concentration hydrogen peroxide has strict requirements for the compatibility of contact materials, which greatly limits the selection of materials used in pressurized delivery systems. Summary of the Invention

[0003] The purpose of this invention is to provide a bladder-type piston propellant pressurization and delivery device to solve the problems of difficult sealing at the threaded connection between the lead screw and nut, high power of the drive motor, and high compatibility requirements of the propellant.

[0004] This invention adopts the following technical solution: a bladder-type piston propellant pressurization and delivery device, comprising:

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

[0006] The piston is located inside the propellant tank;

[0007] The lead screw is located inside the propellant tank; its left end passes through the propellant tank and connects to the reducer, and its right end extends towards the outlet of the propellant tank and is fixed to the inner wall of the propellant tank by a bearing seat; the lead screw is used to drive the piston to move to the right.

[0008] The pressure sleeve is fitted around the outside of the lead screw, with its left end fixedly connected to one side of the piston and its right end extending toward the bearing seat.

[0009] A storage bag containing propellant is located at the periphery of the lead screw and in the inner cavity of the propellant storage tank, and when the piston is pressed to the right, the propellant in the storage bag is pressed out of the outlet of the storage bag, and then the propellant is discharged from the outlet of the propellant storage tank.

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

[0011] Further, the pressure sleeve comprises a first sleeve, a second sleeve and a third sleeve in sequence from left to right, 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] Further, the storage bag is provided with a propellant outlet corresponding to the outlet of the propellant storage tank, so that the propellant is discharged from the propellant outlet of the storage bag and through the outlet of the propellant storage tank.

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

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

[0015] The present application effectively avoids the compatibility requirements of the propellant by installing a storage bag in the propellant storage tank, and effectively solves the sealing problem of the lead screw transmission extrusion.

[0016] The present application cancels the sealing element used by the piston by setting the storage bag, reduces the friction and resistance caused by the sealing element, and reduces the power of the driving motor. At the same time, the high polymer material used by the storage bag is often compatible with the liquid propellant, which is suitable for long-term storage of propellant, and the storage bag isolates the propellant from the structural components, so that the propellant compatibility requirements can be ignored when selecting the structural material.

[0017] The present application realizes the circumferential limiting ability of the piston by the elliptical inner wall profile of the propellant storage tank, realizes the structure simplification and avoids the risk of cutting the storage bag, reduces the commonly used limiting track, the system composition is simpler, meets the circumferential limiting requirements of the lead screw application, and at the same time ensures the smoothness of the wall surface of the propellant storage tank shell, which meets the requirements of the use of the storage bag.

[0018] This invention isolates the lead screw from the reservoir by using a pressure-bearing sleeve, allowing the lead screw to be mounted on the bearing seat and ensuring the smoothness of the reservoir's contact surface. During operation, the axial pressure of the reservoir on the pressure-bearing sleeve prevents the second and third sleeves from moving when the first sleeve moves to the right. This facilitates controlling the propellant discharge flow rate by controlling the speed of the drive motor. Similarly, when the second sleeve moves to the right, the third sleeve remains stationary due to axial pressure, again facilitating control of the propellant discharge flow rate by controlling the speed of the drive motor. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention.

[0020] Among them: 10, propellant tank; 11, piston; 12, reducer; 13, drive motor; 14, lead screw; 15, pressure sleeve; 16, reservoir; 17, first sleeve; 18, second sleeve; 19, third sleeve. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "multiple" means two or more. The term "orientation" in this invention refers to the orientation of the device or element according to the invention. Figure 1 Description of the state's progression.

[0023] This invention discloses a bladder-type piston propellant pressurization and delivery device, such as... Figure 1 As shown, it includes a propellant tank 10, a piston 11, a lead screw 14, a pressure sleeve 15, and a reservoir 16.

[0024] The propellant tank 10 is in a sealed state, the left end of the propellant tank 10 is provided with a speed reducer 12 and a driving motor 13; the piston 11 is located in the propellant tank 10; the lead screw 14 is located in the propellant tank 10; the left end of the lead screw 14 penetrates through the propellant tank 10 and is connected with the speed reducer 12, the right end of the lead screw 14 extends to the outlet of the propellant tank 10 and is fixed on the inner wall of the propellant tank 10 through a bearing seat; the lead screw 14 is used for driving the piston 11 to move rightward.

[0025] The pressure sleeve 15 is sleeved on the outer periphery of the lead screw 14, the left end of the pressure sleeve 15 is fixedly connected with one side of the piston 11, and the right end of the pressure sleeve 15 extends to the direction of the bearing seat; the storage bag 16 contains propellant, is located on the outer periphery of the lead screw 14 and in the inner cavity of the propellant tank 10, and is used for extruding the propellant in the storage bag 16 out of the outlet of the storage bag 16 when the piston 11 extrudes the storage bag 16 rightward, so that the propellant is discharged out of the outlet of the propellant tank 10.

[0026] The storage bag 16 is a ring-shaped container and has a closed structure, is a ring-shaped bag, is made of polytetrafluoroethylene or other high polymer materials, stores liquid propellant in the inside, and is welded with the outlet joint of the propellant tank 10. The storage bag 16 is provided with a propellant outlet corresponding to the outlet of the propellant tank 10, so that the propellant is discharged out of the propellant outlet of the storage bag 16 and the outlet of the propellant tank 10.

[0027] The inner wall of the propellant tank 10 is in an elliptical cross section, and the outer wall is in a circular cross section. The inner wall of the propellant tank 10 is in an elliptical cross section, and the outer wall is in a circular cross section, so that the piston 11 is not limited by a limiting mechanism and is guaranteed to move leftward and rightward without rotating under the rotation of the lead screw 14; the piston 11 is located in the propellant tank 10 and is attached to the inner wall profile of the propellant tank 10, and is used for providing extrusion force for the storage bag 16; the lead screw 14 drives the piston 11 to move rightward through a nut.

[0028] When the system works, the driving motor 13 outputs rotation, drives the lead screw 14 to rotate through the speed reducer 12, drives the piston 11 to move rightward through the transmission of the lead screw 14 and the nut, extrudes the storage bag 16, and makes the storage bag 16 be continuously extruded and shrink, so that the propellant in the storage bag 16 is discharged outwards.

[0029] The pressure sleeve 15 comprises a first sleeve 17, a second sleeve 18 and a third sleeve 19 which are sequentially buckled from left to right, the right end of the third sleeve 19 is fixed on the left side of the bearing seat, and the left end of the first sleeve 17 is fixed on 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] The cross section of the inner wall of the propellant tank 10 in this embodiment is an ellipse with a long semi-axis of 130 mm and a short semi-axis of 125 mm, 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 bag 16 is polytetrafluoroethylene, the thickness of the storage bag 16 is 10 mm, the working pressure of the propellant pressurized delivery device of the bag-type piston 11 is 5.2 MPa, and the flow rate is 0.8939 kg / s. The pressure-bearing sleeve 15 is a three-stage pressure-bearing sleeve 15, the sleeves are connected through 3 mm bosses, and at the same time, an inclination angle and a rounded corner structure are designed at the edge of the sleeve to prevent the storage bag 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 5.5 MPa, the driving force is according to the formula: F = P c πA, wherein F is the driving force required by the driving motor, P c is the working pressure of the propellant 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-bearing sleeve 15, it is calculated that the driving motor needs to generate a driving force of 2.5 x 10 5 N. The speed of the piston 11 is according to the formula: , wherein v is the speed of the piston 11, is the propellant flow rate, and p is the density of hydrogen peroxide.

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

[0035] The above is only a preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A capsule piston propellant pressurized delivery device characterized by, The utility model relates to a kind of propellant tank and its driving mechanism, including: Propellant tank (10), for sealed state, its left end is equipped with speed reducer (12) and drive motor (13); Piston (11), located in the propellant tank (10); Lead screw (14), located in the propellant tank (10);Its left end passes through propellant tank (10) and is connected with speed reducer (12), and its right end extends to the outlet of propellant tank (10), and is fixed on the inner wall of propellant tank (10) by bearing seat;The lead screw (14) is used to drive piston (11) to move right; Pressure sleeve (15), sleeve is set on the periphery of the lead screw (14), its left end is fixedly connected with one side of piston (11), and its right end extends to the direction of bearing seat; Storage bag (16), propellant is contained in it, located in the periphery of the lead screw (14) and the inner cavity of propellant tank (10), for when piston (11) extrudes storage bag (16), propellant in storage bag (16) is extruded from the outlet of storage bag (16), so that propellant is discharged from the outlet of propellant tank (10); The cross section of the inner wall of the propellant tank (10) is oval, and the cross section of the outer wall is circular; The piston (11) does not rotate but only moves left and right under the rotation of the lead screw (14); When working, the piston (11) is driven to move right by the lead screw (14) and nut transmission, and storage bag (16) is extruded, so that storage bag (16) is continuously extruded and shrinks, and the propellant in it is discharged outward.

2. A bladder-piston propellant pressurized delivery device according to claim 1, wherein, The pressure sleeve (15) includes first sleeve (17), second sleeve (18) and third sleeve (19) from left to right, and the right end of the third sleeve (19) is fixed on the left side of the bearing seat, and the left end of the first sleeve (17) is fixed on the right side wall of the piston (11).

3. A bladder-piston propellant pressurized delivery device according to claim 1, wherein The storage bag (16) is provided with a propellant outlet corresponding to the outlet of the propellant tank (10), so that the propellant is discharged from the propellant outlet of the storage bag (16) and discharged through the outlet of the propellant tank (10).

4. A bladder-piston propellant pressurized delivery device as defined in claim 2, wherein The right end of the first sleeve (17) is buckled outside the left end of the second sleeve (18), and the right end of the second sleeve (18) is buckled outside the left end of the third sleeve (19).

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