Pneumatic thrust device

Abstract

The invention provides a pneumatic thrust device which is installed on one separated body of an aircraft and used for abutting against the other separated body so that the two separated bodies can be separated from each other. The pneumatic thrust device comprises a mounting pipe assembly, a push rod is slidably mounted in a first space in the mounting pipe assembly; a second space is arranged in the push rod. When the two separated bodies of the aircraft need to be separated, gas is injected into the second space, the push rod is driven by gas pressure to stretch out of the first space, and the end of the push rod is used for abutting against the other separated body, so that the two separated bodies are far away from each other. The second space is filled with gas with the corresponding air pressure, and the effect of accurately controlling the acting force of the push rod on the other separated body can be achieved. Compared with a separation mode in the prior art, the mode has the advantages that the stability is high, and the impact force is easier to control.

Description

Technical Field

[0001] The present invention generally relates to the field of aircraft technology, and in particular to a pneumatic thrust device. Background Art

[0002] When an aircraft (for example, a rocket) separates and disintegrates while flying in the air, in order to avoid contact and collision between the two separated bodies, a certain separation force must be applied to the two separated bodies or one of them to generate a certain relative motion speed between the two.

[0003] According to the different power sources used, it is mainly divided into two categories: pyrotechnic separation thrust device and non-pyrotechnic separation thrust device.

[0004] The pyrotechnic separation thrust device has a relatively small mass and can provide considerable separation force. However, its disadvantage is that it generally acts at a single point, is prone to excessive impact, and has high requirements on the stiffness and strength of the local structure of the object being pushed.

[0005] The non-explosive separation thrust device mainly includes a cold air drive device, which uses gas to push the two separation bodies away from each other. The pneumatic thrust device has stable performance and low separation impact. The disadvantage is that most pneumatic thrust devices may leak due to long-term storage, resulting in insufficient thrust during use. Summary of the invention

[0006] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a pneumatic thrust device.

[0007] The present invention provides a pneumatic thrust device, comprising: A mounting pipe assembly, the mounting pipe assembly being mounted on a separate body of the aircraft and having a first space therein; A push rod, the push rod is slidably installed in the first space; the push rod has a second space inside; the second space is connected to the first space; The push rod has a first state and a second state; When in the first state, the push rod is completely located in the first space; When in the second state, one end of the push rod extends out of the first space to abut against another separated body of the aircraft, so that the two separated bodies move away from each other; After gas is injected into the second space through the first space, the gas pressure drives the push rod to slide relative to the mounting pipe assembly and switch from the first state to the second state.

[0008] According to the technical solution provided by the present invention, the push rod has a first end and a second end; the outer side wall of the first end has a limiting protrusion; the second end is used to extend out of the first space; The mounting tube assembly comprises: a tube body, wherein the first space is formed inside the tube body; a first mounting seat and a second mounting seat, wherein the first mounting seat and the second mounting seat are respectively mounted at two ends of the tube body; The first mounting seat is connected to the second space and the inflation device; the inflation device is used to inject gas into the second space; The second mounting seat is used to limit the push rod.

[0009] According to the technical solution provided by the present invention, a first valve body is installed on the first mounting seat, and the first valve body is used to allow gas to enter the second space from the inflatable device and prevent gas from entering the inflatable device from the second space; A second valve body is installed at the second end, and the second valve body is used to control the connection and blocking of the second space with the outside air; when the second space is connected with the outside air, the gas is discharged into the outside air through the second valve body.

[0010] According to the technical solution provided by the present invention, the opening direction of the first valve body communicating with the second space is perpendicular to the extension direction of the push rod.

[0011] According to the technical solution provided by the present invention, there is also a mounting gap between the inner wall of the tube body and the outer wall of the push rod; An elastic member is arranged in the installation gap, one end of the elastic member abuts against the limiting protrusion, and the other end abuts against the second mounting seat, and is used to drive the push rod to switch from the second state to the first state when the gas in the second space is discharged to the outside air through the second valve body.

[0012] According to the technical solution provided by the present invention, a vent hole is provided at a position of the tube body close to the second mounting seat, for discharging gas in the mounting gap when the push rod extends out of the first space.

[0013] According to the technical solution provided by the present invention, a first sealing ring is installed between the first mounting seat and the tube body to prevent the gas in the second space from leaking through the gap between the first mounting seat and the tube body.

[0014] According to the technical solution provided by the present invention, a second sealing ring is installed between the limiting protrusion and the inner side wall of the tube body to prevent the gas in the second space from leaking through the gap between the limiting protrusion and the tube body.

[0015] According to the technical solution provided by the present invention, a sliding block is further installed between the limiting protrusion and the inner side wall of the tube body, so as to reduce the friction force when the push rod and the tube body slide relative to each other.

[0016] According to the technical solution provided by the present invention, there are multiple second sealing rings; and the sliding block is located between the multiple second sealing rings.

[0017] The beneficial effects of the present invention are: The present invention uses a pneumatic thrust device to separate two separated bodies of an aircraft. The pneumatic thrust device is installed on one of the separated bodies, and includes: a mounting tube assembly, in which a push rod is slidably installed in a first space inside the assembly; and a second space is provided inside the push rod. When the two separated bodies of the aircraft need to be separated, gas is injected into the second space, and the air pressure is used to drive the push rod to extend out of the first space. The end of the push rod is used to abut against the other separated body, so that the two separated bodies are moved away from each other. By filling the second space with gas of corresponding air pressure, the effect of accurately controlling the force exerted by the push rod on the other separated body can be achieved. Compared with the separation method in the prior art, this method has the advantages of strong stability and easier control of impact force. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 is a cross-sectional view of a push rod of a pneumatic thrust device in a first state; Figure 2 is a cross-sectional view of a push rod of a pneumatic thrust device in a second state; Among them: 1. push rod; 2. limiting protrusion; 3. tube body; 4. first mounting seat; 5. second mounting seat; 6. first valve body; 7. second valve body; 8. elastic member; 9. exhaust hole; 10. first sealing ring; 11. second sealing ring; 12. sliding block. DETAILED DESCRIPTION

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It should also be noted that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0020] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] The present invention provides a pneumatic thrust device, comprising: A mounting pipe assembly, the mounting pipe assembly being mounted on a separate body of the aircraft and having a first space therein; A push rod 1, wherein the push rod 1 is slidably mounted in the first space; a second space is provided inside the push rod 1; and the second space is connected to the first space; The push rod 1 has a first state and a second state; refer to Figure 1 , when in the first state, the push rod 1 is completely located in the first space; refer to Figure 2 , when in the second state, one end of the push rod 1 extends out of the first space to abut against another separated body of the aircraft, so that the two separated bodies move away from each other; After gas is injected into the second space through the first space, the gas pressure drives the push rod 1 to slide relative to the mounting pipe assembly and switch from the first state to the second state.

[0022] Specifically, when the two separation bodies of the aircraft need to be separated, gas is injected into the second space, and the gas pressure is used to drive the push rod to extend out of the first space. The end of the push rod is used to abut against the other separation body to move the two separation bodies away from each other.

[0023] Filling the second space with gas of corresponding air pressure can achieve the effect of accurately controlling the force of the push rod on the other separation body. Compared with the separation method in the prior art, this method has the advantages of strong stability and easier control of impact force.

[0024] Furthermore, the push rod 1 has a first end and a second end; the outer side wall of the first end has a limiting protrusion 2; the second end is used to extend out of the first space; The mounting pipe assembly comprises: A tube body 3, wherein the first space is formed inside the tube body 3; A first mounting seat 4 and a second mounting seat 5, wherein the first mounting seat 4 and the second mounting seat 5 are respectively mounted at two ends of the tube body 3; The first mounting seat 4 is connected to the second space and the inflation device; the inflation device is used to inject gas into the second space; The second mounting seat 5 is used to limit the push rod 1 .

[0025] Specifically, the first end of the push rod 1 has a limiting protrusion 2 and is located between two mounting seats. When the push rod 1 slides, the two mounting seats limit the limiting protrusion 2 therebetween to ensure that the push rod will not separate from the tube body 3.

[0026] Furthermore, a first valve body 6 is installed on the first mounting seat 4, and the first valve body 6 is used to allow gas to enter the second space from the inflatable device and prevent gas from entering the inflatable device from the second space; A second valve body 7 is installed at the second end, and the second valve body 7 is used to control the connection and blocking of the second space with the outside air; when the second space is connected with the outside air, the gas is discharged into the outside air through the second valve body 7.

[0027] In some embodiments, the first valve body 6 is a one-way valve, and the second valve body 7 is a solenoid valve.

[0028] Specifically, when the inflation device injects gas into the second space, the gas moves at a faster speed and has a higher kinetic energy. When the gas collides with the inner wall of the push rod 1, it may generate a higher force on the inner wall of the push rod 2. This may cause the push rod 1 to extend out of the first space prematurely under the action of the rapidly moving gas before sufficient air pressure is injected into the second space, thereby causing the two separation bodies to separate prematurely.

[0029] In order to overcome the above problem, in this embodiment, the opening direction of the first valve body 6 communicating with the second space is perpendicular to the extension direction of the push rod 1, which can effectively reduce the flow rate of the gas entering the second space.

[0030] In some embodiments, there is a mounting gap between the inner wall of the tube body 3 and the outer wall of the push rod 1; An elastic member 8 is provided in the installation gap, one end of the elastic member 8 abuts against the limiting protrusion 2, and the other end abuts against the second mounting seat 5, and is used to drive the push rod 1 to switch from the second state to the first state when the gas in the second space is discharged to the outside air through the second valve body 7.

[0031] In this embodiment, the elastic member 8 is a spring.

[0032] By utilizing the abutting effect of the elastic member 8 , the problem that the push rod 1 may extend out of the first space during the process of injecting gas into the second space can be eliminated.

[0033] Specifically, the work process includes: The push rod 1 is initially in the first state, the first valve body 6 is closed, and the second valve body 7 is closed.

[0034] During use, when gas is injected into the second space, the first valve body 6 automatically opens to allow gas to enter the second space. As a result, the air pressure in the push rod 1 increases rapidly, and the push rod 1 is acted upon by the air pressure to compress the elastic member 8 and switch to the second state, with the second end extending out of the first space and abutting against the other separation body.

[0035] When the push rod 1 is in the second state, the injection of gas into the second space stops; and the first valve body 6 is automatically closed.

[0036] When the two separated bodies of the aircraft move away from each other, the second valve body 7 is controlled to open to discharge the gas in the second space, the air pressure in the second space is reduced, and the push rod 1 is driven by the elastic member 8 to return to the first state.

[0037] Furthermore, a gas exhaust hole 9 is provided at a position of the tube body 3 close to the second mounting seat 5 , for exhausting the gas in the mounting gap when the push rod 1 extends out of the first space.

[0038] Specifically, when the push rod 1 switches from the first state to the second state, the gas in the installation gap is discharged into the outside air through the exhaust hole 9.

[0039] When the push rod 1 extends out of the first space, the volume of the installation gap will decrease. If the gas therein is not discharged, the pressure of the gas in the installation gap may gradually increase and eventually balance with the air pressure in the second space, causing the distance that the push rod 1 extends out of the first space to become shorter.

[0040] Therefore, the exhaust hole 9 can eliminate the influence of the gas in the installation gap on the movement state of the push rod 1.

[0041] Specifically, during the process of injecting gas into the second space, as the gas pressure increases, the push rod 1 will still move a small amount before the gas pressure reaches a predetermined value. Therefore, the present invention also has the following design: In some embodiments, permanent magnets are installed on the first mounting seat 4 near the first end of the push rod 1 and the first end of the push rod 1 near the first mounting seat 4. The same poles of the two permanent magnets are arranged opposite to each other, and a shock-absorbing washer is arranged between them.

[0042] When the air pressure in the second space does not reach a predetermined value, the push rod 1 is prevented from extending out of the first space in advance by utilizing the effect of mutual attraction by magnetic force.

[0043] When the gas pressure is sufficient, the gas pressure is sufficient to overcome the magnetic force, driving the push rod 1 to switch from the first state to the second state. After the second valve body 7 discharges the gas, the magnetic forces of the two permanent magnets attract each other, driving the push rod 1 to switch to the first state. The shock-absorbing washer can prevent the two permanent magnets from colliding with each other and breaking.

[0044] Compared with the spring return method, this design method will not cause the push rod 1 to produce a small amount of displacement as the air pressure increases during the process of injecting gas into the second space.

[0045] In some embodiments, the elastic member 8 and the permanent magnet can also be installed at the same time; during the process of injecting gas into the second space, due to magnetic attraction, the push rod 1 will not move a small amount in advance. When the air pressure reaches a preset value, the air pressure is sufficient to overcome the magnetic force and compress the elastic member 8, driving the push rod 1 to extend out of the first space.

[0046] When the second valve body 7 is opened and the gas in the second space is discharged, the elastic member 8 drives the push rod 1 to return to its original position, thereby causing the two magnets to be attracted again.

[0047] In this case, the magnetic field strength of the permanent magnet and the stiffness coefficient of the elastic member 8 are both set to be relatively small, thereby avoiding the situation where the air pressure needs to overcome an excessive force, which would make it difficult for the push rod 1 to extend out of the first space.

[0048] In some embodiments, the permanent magnet may also be replaced by an electromagnet, and before injecting the gas into the second space, the electromagnet is turned on to generate a magnetic field.

[0049] Since the stronger the magnetic field, the greater the air pressure required to overcome the magnetic field and the elastic member 8, and thus the stronger the force when the push rod 1 is extended. Therefore, the size of the magnetic field generated by the battery iron is set according to the thrust required to be provided by the push rod 1. In this way, the size of the force when the push rod 1 is extended and abuts against another separation body can be controlled.

[0050] In order to avoid air leakage between the tube body 3 and the push rod 1, or excessive friction that makes it difficult for relative sliding, the present invention also has the following design: Furthermore, a first sealing ring 10 is installed between the first mounting seat 4 and the tube body 3 to prevent the gas in the second space from leaking through the gap between the first mounting seat 4 and the tube body 3 .

[0051] Furthermore, a second sealing ring 11 is installed between the limiting protrusion 2 and the inner wall of the tube body 3 to prevent the gas in the second space from leaking through the gap between the limiting protrusion 2 and the tube body 3 .

[0052] Furthermore, a sliding block 12 is installed between the limiting protrusion 2 and the inner wall of the tube body 3 to reduce the friction force when the push rod 1 and the tube body 3 slide relative to each other.

[0053] Furthermore, in order to prevent gas leakage from the sliding block 12 , there are multiple second sealing rings 11 ; the sliding block 12 is located between the multiple second sealing rings 11 .

[0054] The above description is only a preferred embodiment of the present invention and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present invention is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present invention (but not limited to) to form a technical solution.

Claims

1. A pneumatic thrust device, characterized in that: include: A mounting pipe assembly, the mounting pipe assembly being mounted on a separate body of the aircraft and having a first space therein; A push rod (1), the push rod (1) being slidably mounted in the first space; the push rod (1) having a second space inside; the second space being in communication with the first space; The push rod (1) has a first state and a second state; When in the first state, the push rod (1) is completely located in the first space; When in the second state, one end of the push rod (1) extends out of the first space to abut against another separated body of the aircraft, so that the two separated bodies move away from each other; After gas is injected into the second space through the first space, the gas pressure drives the push rod (1) to slide relative to the mounting tube assembly and switches from the first state to the second state.

2. A pneumatic thrust device according to claim 1, characterized in that: The push rod (1) has a first end and a second end; the outer side wall of the first end is provided with a limiting protrusion (2); the second end is used to extend out of the first space; The mounting pipe assembly comprises: A tube body (3), wherein the tube body (3) has the first space inside; A first mounting seat (4) and a second mounting seat (5), wherein the first mounting seat (4) and the second mounting seat (5) are respectively mounted on two ends of the tube body (3); The first mounting seat (4) is connected to the second space and the inflation device; the inflation device is used to inject gas into the second space; The second mounting seat (5) is used to limit the position of the push rod (1).

3. A pneumatic thrust device according to claim 2, characterized in that: A first valve body (6) is mounted on the first mounting seat (4), and the first valve body (6) is used to allow gas to enter the second space from the inflation device, and to prevent gas from entering the inflation device from the second space; A second valve body (7) is installed at the second end, and the second valve body (7) is used to control the connection and blocking of the second space with the outside air; when the second space is connected with the outside air, the gas is discharged into the outside air through the second valve body (7).

4. A pneumatic thrust device according to claim 3, characterized in that: The direction of the opening of the first valve body (6) communicating with the second space is perpendicular to the extension direction of the push rod (1).

5. A pneumatic thrust device according to claim 3, characterized in that: There is also a mounting gap between the inner wall of the tube body (3) and the outer wall of the push rod (1); An elastic member (8) is provided in the installation gap, one end of the elastic member (8) abuts against the limiting protrusion (2), and the other end abuts against the second installation seat (5), and is used to drive the push rod (1) to switch from the second state to the first state when the gas in the second space is discharged into the outside air through the second valve body (7).

6. A pneumatic thrust device according to claim 5, characterized in that: The tube body (3) is provided with an exhaust hole (9) at a position close to the second mounting seat (5), which is used to exhaust the gas in the mounting gap when the push rod (1) extends out of the first space.

7. A pneumatic thrust device according to claim 3, characterized in that: A first sealing ring (10) is installed between the first mounting seat (4) and the tube body (3) to prevent the gas in the second space from leaking through the gap between the first mounting seat (4) and the tube body (3).

8. A pneumatic thrust device according to claim 2, characterized in that: A second sealing ring (11) is installed between the limiting protrusion (2) and the inner side wall of the tube body (3) to prevent the gas in the second space from leaking through the gap between the limiting protrusion (2) and the tube body (3).

9. A pneumatic thrust device according to claim 8, characterized in that: A sliding block (12) is also installed between the limiting protrusion (2) and the inner wall of the tube body (3) to reduce the friction force when the push rod (1) and the tube body (3) slide relative to each other.

10. A pneumatic thrust device according to claim 9, characterized in that: There are a plurality of the second sealing rings (11); and the sliding block (12) is located between the plurality of the second sealing rings (11).

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