CN114934860A

CN114934860A - Motor-regulated pintle injector

Info

Publication number: CN114934860A
Application number: CN202210650820.XA
Authority: CN
Inventors: 俞南嘉; 焦博威; 蔡国飙; 李天文; 冮强; 赵增; 周闯; 韩树焘; 刘亚冰
Original assignee: Beihang University; Beijing Power Machinery Institute
Current assignee: Beihang University; Beijing Power Machinery Institute
Priority date: 2022-06-09
Filing date: 2022-06-09
Publication date: 2022-08-23

Abstract

The invention provides a motor-regulated pintle injector, which relates to the technical field of rocket engines and comprises: a head cover member, an injector body, a central plunger, and a motor member; through set up a plurality of direct current orifice in the radial direction of insufflator main part, propellant in the liquid collecting cavity enters into the insufflating runner that forms between central plunger and the insufflator main part through the direct current orifice, propellant is followed the propellant spout blowout along the insufflating runner, and the motor member can drive the center plunger and reciprocate in the flow chamber, and then the blowout area of control propellant spout, it is more accurate to use motor member control blowout area, reach the purpose of controlling propellant flow effectively, it is inaccurate to have alleviated the adoption hand regulation aperture control propellant flow that exists among the prior art, lead to engine thrust unstable, and adopt the long technical problem of experiment duration can be prolonged to manual mode.

Description

Motor-regulated pintle injector

Technical Field

The invention relates to the technical field of rocket engines, in particular to a motor-regulated pintle injector.

Background

Injectors, being part of rocket engines, are an important factor affecting engine performance. The pintle injector is a movable injector capable of adjusting the injection area, the pintle injector is divided into two channels, a central propellant is generally sprayed out along the radial direction, a peripheral propellant is sprayed out along the axial direction, and the central propellant and the peripheral propellant are impacted at the head of the injector to enable the propellants to be atomized and mixed. The pintle injector has the advantages of high combustion efficiency, stable combustion, strong adaptability, large thrust transformation ratio, simple structure, low cost and the like.

The reusable engine technology is a major subject of development in all countries, wherein a variable thrust liquid rocket engine is also taken as a main research direction, a pintle injector is taken as a key control thrust component, and the thrust of the engine is required to be adjusted by changing the supply flow of a propellant.

However, most of the prior single-component pintle injectors generally adopt a method of manually adjusting the opening degree, so that the control of the propellant flow rate is not accurate, the thrust control of an engine is unstable, and the general rule cannot be explored. Secondly, the manual adjustment work of the opening degree of the pintle can also greatly increase the workload of the experiment and prolong the experiment duration.

Disclosure of Invention

The invention aims to provide a motor-regulated pintle injector, which aims to solve the technical problems that the thrust of an engine is unstable due to inaccurate control of the flow of a propellant by manually regulating the opening degree and the experiment time is prolonged by manually regulating the opening degree in the prior art.

In a first aspect, the present invention provides a motor-regulated pintle injector comprising: a head cover member, an injector body, a central plunger, and a motor member;

the head cover member is provided with a liquid collecting cavity, the injector main body is arranged in the liquid collecting cavity, a plurality of direct-current spray holes are formed in the radial direction of the injector main body, and propellant in the liquid collecting cavity enters a flow cavity in the injector main body through the direct-current spray holes;

the central plunger is arranged in the flow cavity, a distance is reserved between the outer wall of the central plunger and the inner wall of the injector main body to form an injection flow channel, a propellant nozzle is formed between the outer wall of the bottom of the central plunger and the central nozzle at the bottom of the injector main body, the motor component is in transmission connection with the central plunger, and the motor component is configured to be capable of driving the central plunger to move in the flow cavity so as to adjust the ejection area of the propellant nozzle.

In an alternative embodiment of the method of the present invention,

the motor component comprises a driving motor, a coupler, a rotating screw rod, a screw rod nut, a piston and a pintle connecting piece;

the driving shaft of the driving motor is connected with one end of the coupler, the other end of the coupler is connected with the rotating lead screw, the lead screw nut is in threaded connection with the rotating lead screw, and the driving motor is configured to drive the rotating lead screw to rotate through the coupler so as to drive the lead screw nut to rotate along the rotating lead screw;

the screw rod nut is connected with the piston, one end, far away from the screw rod nut, of the piston is connected with the pintle connecting piece, and the pintle connecting piece is used for installing the central plunger.

In an alternative embodiment of the method of the present invention,

the motor component also comprises a rubber magnetic ring and a cylinder anti-collision pad;

the outer wall of the piston is provided with a magnetic ring placing groove, and the rubber magnetic ring is arranged in the magnetic ring placing groove;

a boss extends outwards from the outer wall of the piston, and the end face, close to the central plunger, of the boss is provided with the cylinder anti-collision pad;

and the middle part of the piston is provided with an accommodating cavity for accommodating the rotary screw rod.

In an alternative embodiment of the method of the present invention,

the motor component also comprises a connecting key, a cylinder sleeve and a cylinder cover;

the driving motor is provided with a connecting through hole, one end of the cylinder sleeve is connected with the connecting through hole, the other end of the cylinder sleeve is connected with the cylinder cover, and the piston moves in the cylinder sleeve;

the outer wall of piston has and is used for fixing the spread groove of connecting key, the inner wall of cylinder cap inwards extends has the butt limit, the butt limit is used for restricting the removal of connecting piece.

In an alternative embodiment of the method of the present invention,

the motor member further includes a motor bracket;

the motor bracket is provided with a first connecting hole and a second connecting hole, the motor bracket is connected with the cylinder cover through the first connecting hole, and the motor bracket is connected with the head cover component through the second connecting hole;

the motor bracket has a plurality of support beams.

In an alternative embodiment of the method of the present invention,

the pintle connecting piece is provided with a pintle threaded hole, the bottom of the piston is provided with a threaded connecting part, and the threaded connecting part is connected with the pintle threaded hole;

the pintle connecting piece is provided with a plunger connecting hole, and the pintle connecting piece is connected with the central plunger through the plunger connecting hole.

In an alternative embodiment of the method of the present invention,

the top of the head cover component is provided with a through hole for the central plunger to pass through;

the side wall of the head cover member has a liquid propellant inlet;

the bottom of the head cover member has a head cover screw hole for connecting with the injector body;

the bottom of the head cover member has a fixing through-hole for connection with a combustion chamber;

the top of the head cover member has a motor mounting hole for connection with the motor bracket.

In an alternative embodiment of the method of the present invention,

a central nozzle is formed at the bottom opening of the injector main body, and the injection flow channel is formed between the central nozzle and the central plunger;

the bottom of the injector main body is provided with an injector mounting hole, and a countersunk screw penetrates through the injector mounting hole and extends into the cranial cover threaded hole;

the injector body has a positioning projection at the top thereof, and the head cover member has a positioning groove into which the positioning projection projects.

In an alternative embodiment of the method of the present invention,

the top of the central plunger is provided with a connecting part, the connecting part is provided with a connecting threaded hole, and the connecting part is connected with the pintle connecting piece through the connecting threaded hole;

the side wall of the central plunger is provided with an upper bulge and a lower bulge, and the upper end face of the upper bulge can be abutted against the injector main body so as to limit the movement of the central plunger.

In an alternative embodiment of the method of the invention,

the upper bulge and the lower bulge are arranged at intervals to form a sealing groove for mounting an O-shaped ring;

the bottom of the central plunger is provided with a plunger inclined plane, and the injection flow channel is formed between the plunger inclined plane and the central nozzle.

The invention provides a motor-regulated pintle injector, which comprises: a head cover member, an injector body, a central plunger, and a motor member; through set up a plurality of direct current orifice in the radial direction of insufflator main part, propellant in the liquid collecting cavity enters into the insufflating runner that forms between central plunger and the insufflator main part through the direct current orifice, propellant is followed the propellant spout blowout along the insufflating runner, and the motor member can drive the center plunger and reciprocate in the flow chamber, and then the blowout area of control propellant spout, it is more accurate to use motor member control blowout area, reach the purpose of controlling propellant flow effectively, it is inaccurate to have alleviated the adoption hand regulation aperture control propellant flow that exists among the prior art, lead to engine thrust unstable, and adopt the long technical problem of experiment duration can be prolonged to manual mode.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a cross-sectional view of a motor-regulated pintle injector provided in accordance with an embodiment of the present invention;

FIG. 2 is a sectional view of a motor member of a motor-regulated pintle injector provided in accordance with an embodiment of the present invention;

FIG. 3 is a cross-sectional view of the assembled structure of the head cover member, the injector body and the central plunger of the motor-regulated pintle injector provided in an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a head cover member of a motor-regulated pintle injector provided in accordance with an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a head cover member of the syringe with a motor for adjusting a pintle according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view of the structure of the injector body in a motor-regulated pintle injector provided in accordance with embodiments of the present invention;

FIG. 7 is a schematic structural diagram of an injector body in a motor-regulated pintle injector provided by an embodiment of the invention;

FIG. 8 is a cross-sectional view of a central plunger in a motor-regulated pintle injector provided in accordance with an embodiment of the present invention;

FIG. 9 is a schematic diagram of a central plunger in a motor-regulated pintle injector provided in accordance with an embodiment of the present invention;

FIG. 10 is a schematic diagram of a motor for adjusting a drive motor in a pintle injector according to an embodiment of the present invention;

FIG. 11 is a cross-sectional view of a screw nut in a motor-regulated pintle injector, according to an embodiment of the present invention;

FIG. 12 is a schematic structural diagram of a feed screw nut in a motor-regulated pintle injector provided in an embodiment of the present invention;

FIG. 13 is a cross-sectional view of a piston in a motor-regulated pintle injector, according to an embodiment of the present invention;

FIG. 14 is a schematic diagram of a piston in a motor-regulated pintle injector provided in accordance with embodiments of the present invention;

FIG. 15 is a schematic diagram of the structure of a cylinder liner in a motor-regulated pintle injector provided in accordance with an embodiment of the present invention;

FIG. 16 is a cross-sectional view of a cylinder head of a motor-regulated pintle injector, according to an embodiment of the present invention;

FIG. 17 is a schematic structural diagram of a cylinder cover in a motor-regulated pintle injector provided in an embodiment of the present invention;

FIG. 18 is a cross-sectional view of a motor mount for a motor-regulated pintle injector, according to an embodiment of the present invention;

FIG. 19 is a schematic diagram of a motor bracket of a motor-regulated pintle injector according to an embodiment of the present invention;

FIG. 20 is a schematic diagram of a pintle coupling of the motor-regulated pintle injector provided in an embodiment of the present invention.

An icon: 1-a head cover member; 101-a through hole; 102-a liquid propellant inlet; 103-head cover thread hole; 104-fixing through holes; 105-motor mounting holes; 106-positioning groove; 2-an injector body; 201-direct current jet orifice; 202-a central spout; 203-injector mounting holes; 204-positioning projection; 3-a central plunger; 301-a connecting portion; 302-upper projection; 303-a sealing groove; 304-plunger ramp; 4-O-shaped rings; 5-countersunk head screw; 6-driving a motor; 601-a drive shaft; 602-connecting vias; 7-a coupler; 8-a screw nut; 801-internal thread section; 802-nut securing holes; 9-a piston; 901-magnetic ring placing groove; 902-boss; 903-a containing cavity; 904-connecting groove; 905-a threaded connection; 906-nut mounting holes; 10-a rubber magnet ring; 11-cylinder crash pad; 12-a connecting bond; 13-rotating the screw rod; 14-cylinder liner; 1401-a through hole; 1402-cylinder liner inner cavity; 15-cylinder cover; 1501-a sliding groove; 1502-third connection hole; 1503-fourth connecting hole; 1504-abutting edges; 16-a motor support; 1601-support beam; 1602-a first connection hole; 1603 — second connection hole; 17-pintle connection; 1701-pintle threaded hole; 1702-plunger connecting hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that the present product is conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

At present, most single-component pintle injectors generally adopt a method of manually adjusting the opening degree, the propellant flow rate is controlled inaccurately, the thrust control of an engine is unstable, and the general rule cannot be explored. Secondly, the manual adjustment work of the opening degree of the pintle can also greatly increase the workload of the experiment and prolong the experiment duration. The embodiment provides a motor-regulated pintle injector, which outputs instructions to a motor component through a computer to control the forward and backward movement of a pintle so as to control the opening and finally achieve the purpose of controlling the flow of propellant.

As shown in fig. 1, 2, 3 and 4, the present embodiment provides a motor-regulated pintle injector, including: a head cover member 1, an injector body 2, a center plunger 3, and a motor member; the head cover member 1 is provided with a liquid collecting cavity, the injector main body 2 is arranged in the liquid collecting cavity, a plurality of direct current spray holes 201 are arranged along the radial direction of the injector main body 2, and propellant in the liquid collecting cavity enters a flow cavity in the injector main body 2 through the plurality of direct current spray holes 201; the central plunger 3 is arranged in the flow cavity, the outer wall of the central plunger 3 is spaced from the inner wall of the injector body 2 to form an injection flow channel, a propellant nozzle is formed between the outer wall of the bottom of the central plunger 3 and the central nozzle 202 at the bottom of the injector body 2, the motor component is in transmission connection with the central plunger 3, and the motor component is configured to be capable of driving the central plunger 3 to move in the flow cavity so as to adjust the ejection area of the propellant nozzle.

The present embodiment provides a motor-regulated pintle injector, comprising: a head cover member 1, an injector body 2, a center plunger 3, and a motor member; the plurality of direct current jet holes 201 are formed in the radial direction of the injector main body 2, propellant in the liquid collecting cavity enters the jetting flow channel formed between the central plunger 3 and the injector main body 2 through the direct current jet holes 201, the propellant is jetted from the propellant nozzle along the jetting flow channel, the motor component can drive the central plunger 3 to move up and down in the flow cavity, the jetting area of the propellant nozzle is controlled, the motor component is used for controlling the jetting area to be more accurate, the purpose of effectively controlling the flow of the propellant is achieved, the technical problem that the thrust of an engine is unstable due to the fact that the propellant flow is controlled inaccurately by manually adjusting the opening in the prior art is solved, and the technical problem that the experiment duration is prolonged by adopting a manual mode is solved.

Regarding the structure and shape of the head cover member 1, specifically:

as shown in fig. 4 and 5, a liquid collecting cavity is formed inside the head cover member 1, the injector body 2 is located in the liquid collecting cavity, a through hole 101 is formed in the top of the head cover member 1, the top of the central plunger 3 passes through the through hole 101 to be connected with the motor member, a liquid propellant inlet 102 is formed in the side wall of the head cover member 1, an external liquid propellant enters the liquid collecting cavity through the liquid propellant inlet 102, a head cover threaded hole 103 is formed in the bottom of the head cover member 1, the head cover threaded hole 103 is connected with the injector body 2, and the injector body 2 and the head cover member 1 are connected; the bottom of the head cover component 1 is provided with a fixing through hole 104, and the fixing through hole 104 is fixed on an external combustion chamber through a bolt; the top of the head cover component 1 is provided with a motor mounting hole 105, the motor mounting hole 105 is connected with a motor bracket 16 in the motor component, and the motor component is integrally fixed on the head cover component 1; the locating groove 106 has been seted up to the inner wall of top in the collection liquid chamber, with the protruding 204 looks adaptations of location on the injector main part 2, the position between fixed skull member 1 and the injector main part 2 avoids taking place the displacement between skull member 1 and the injector main part 2.

Regarding the structure and shape of the injector body 2, in particular:

as shown in fig. 6 and 7, a plurality of straight-flow jet holes 201 are arranged along the radial direction of the injector body 2, and the propellant in the liquid collecting cavity enters the flow cavity through the plurality of straight-flow jet holes 201; the bottom opening of the injector main body 2 forms a central nozzle 202, an annular injection flow channel is formed between the central plunger 3 and the central nozzle 202 in the flow cavity, the propellant in the flow cavity is injected through the injection flow channel, and the width of the injection flow channel is determined by the axial position of the central plunger 3; an injector mounting hole 203 is formed in the bottom of the injector main body 2, and a countersunk screw 5 penetrates through the injector mounting hole 203 and extends into the head cover threaded hole 103 to fix the injector main body 2 and the head cover member 1; the top of the injector body 2 is provided with a positioning protrusion 204, the inner wall of the head cover member 1 is provided with a positioning groove 106 correspondingly, and in the assembling process, the positioning protrusion 204 extends into the positioning groove 106 to fix the positions of the injector body 2 and the head cover member 1.

Regarding the structure and shape of the central plunger 3, in particular:

as shown in fig. 8 and 9, the central plunger 3 is a movable component, which is a necessary component for adjusting the opening degree by the motor, the top of the central plunger 3 is provided with a connecting part 301, the connecting part 301 is connected with a motor member, and the driving force generated by the motor member acts on the connecting part 301 to move the central plunger 3 up and down in the flow chamber; the outer surface of the central plunger 3 is provided with an upper bulge 302 and a lower bulge, the upper bulge 302 has two functions, the upper end surface of the upper bulge 302 can be in contact with the inner wall of the head cover member 1 to limit the moving range of the central plunger 3 and prevent the central plunger 3 from being separated from the injector body 2, a sealing groove 303 is formed between the upper bulge 302 and the lower bulge in a surrounding manner, and an O-shaped ring 4 is placed in the sealing groove 303 to play a sealing role and prevent the flow cavity from entering a balance cavity formed between the central plunger 3 and the inner wall of the head cover member 1; the bottom of the central plunger 3 has a plunger ramp 304 that forms an injection channel with the central nozzle 202, the width of which is determined by the manual control of the motor that controls the central plunger 3.

Regarding O type circle 4, O type circle 4 is used for balanced chamber and flow chamber, balanced chamber and collects the sealed between the liquid chamber, maintains the pressure that balanced intracavity equals combustion chamber pressure, also avoids simultaneously that the pressure environment of collection liquid chamber and flow chamber suffers destruction, worsens the atomizing injection performance of nozzle. The O-shaped ring 4 ensures that no propellant working medium passes through the balance cavity, so that the injector can have better working characteristics and high system stability.

Regarding the structure and shape of the drive motor 6, specifically:

as shown in fig. 10, the driving motor 6 is used as a power supply element of the motor driving part, the end of the driving motor 6 extends out of the driving shaft 601, the driving motor 6 is provided with a plurality of connecting through holes 602, and the connecting through holes 602 are connected with the cylinder sleeve 14 through bolts.

Regarding the structure and shape of the feed screw nut 8, specifically:

as shown in fig. 11 and 12, the feed screw nut 8 is used as a conversion element of a transmission mode, and converts the rotary rotation output by the motor into linear motion transmission of the piston 9, the middle part of the feed screw nut 8 penetrates through, the inner wall of the feed screw nut 8 is provided with an internal thread section 801, the internal thread section 801 is in threaded connection with the transfer feed screw, and the rotary feed screw 13 drives the feed screw nut 8 to rotate and linearly move along the rotary feed screw 13; a plurality of nut fixing holes 802 are formed in the feed screw nut 8, the nut fixing holes 802 are connected with the piston 9 through bolts, and the piston 9 is driven to move linearly along with the linear movement of the feed screw nut 8.

Regarding the structure and shape of the piston 9, in particular:

as shown in fig. 13 and 14, the piston 9 is a main actuating element driven by a motor, and the linear motion of the piston 9 is driven by the linear motion of the lead screw nut 8 and is finally fed back to the central plunger 3, so as to drive the central plunger 3 to perform the linear motion and finally adjust the opening of the pintle injector; the top of the piston 9 extends outwards, a boss 902 extends outwards from a position close to the bottom of the top of the piston 9, a magnetic ring placing groove 901 is formed between the boss 902 and the top of the piston 9 in an enclosing manner, the rubber magnetic ring 10 is installed in the magnetic ring placing groove 901, and the rubber magnetic ring 10 is used for determining the movement position of the piston 9 by installing an induction device outside the cylinder so as to perform magnetic induction with the rubber magnetic ring 10; the lower terminal surface of boss 902 is the wall of installation cylinder crash pad 11, and the effect of cylinder crash pad 11 is to cushion piston 9 and cylinder wall collision, reduces piston 9 and cylinder loss, plays the cushioning effect.

The piston 9 is of a hollow structure, an accommodating cavity 903 is formed inside the piston, and the rotary screw rod 13 extends into the accommodating cavity 903, so that the extending space of the rotary screw rod 13 is increased, and the adjusting width is greatly increased; the digging nose of the piston 9 is provided with a connecting groove 904 for placing a connecting key 12, the connecting key 12 moves along with the piston 9, the connecting key 12 is used for controlling the moving range of the piston 9, and when the connecting key 12 is contacted with the cylinder cover 15, the piston 9 reaches the adjusting limit position; the bottom of the piston 9 is provided with a threaded connection part 905, the threaded connection part 905 is connected with a pintle connecting piece 17 and is connected with the central plunger 3 through the pintle connecting piece 17 to drive the central plunger 3 to move; the piston 9 is provided with a nut mounting hole 906, and is connected with the feed screw nut 8 through the nut mounting hole 906, so that the feed screw nut 8 and the piston 9 move synchronously.

Regarding the structure and shape of the cylinder liner 14, specifically:

as shown in fig. 15, the cylinder sleeve 14 serves to connect the driving motor 6 with the cylinder cover 15 and protect internal components, the cylinder sleeve 14 is provided with a through hole 1401, the driving motor 6, the cylinder sleeve 14 and the cylinder cover 15 are connected in series through a bolt to form a motor driving main body, the cylinder sleeve 14 is hollow to form a cylinder sleeve inner cavity 1402, the cylinder sleeve inner cavity 1402 comprises a coupler 7, a screw rod nut 8, a piston 9, a rubber magnetic ring 10, a cylinder crash pad 11, a rotating screw rod 13 and the like, and the movement of the parts is performed in the cylinder sleeve inner cavity 1402 in the cylinder sleeve 14.

Regarding the structure and shape of the cylinder head 15, specifically:

as shown in fig. 16 and 17, the cylinder cover 15 is used for connecting the cylinder sleeve 14 and the head cover member 1 and positioning the movement of the piston 9, the inner wall of the cylinder cover 15 extends inwards to form an abutting edge 1504, a sliding groove 1501 is formed between the abutting edge 1504 and the inner wall of the cylinder cover 15, and the connecting key 12 moves in the sliding groove 1501 and is the movement boundary of the piston 9 when the connecting key 12 is in contact with the abutting edge 1504; the cylinder cover 15 is provided with a third connecting hole 1502 and a fourth connecting hole 1503, the third connecting hole 1502 is a threaded hole between the cylinder cover 15 and the motor support 16, the cylinder cover 15 is connected with the motor support 16 through the third connecting hole 1502, the fourth connecting hole 1503 is a threaded hole between the cylinder cover 15 and the cylinder sleeve 14, and the cylinder cover 15 is connected with the cylinder sleeve 14 through the fourth connecting hole 1503.

Regarding the structure and shape of the motor bracket 16, specifically:

as shown in fig. 18 and 19, the motor bracket 16 is used for supporting the motor member and the pintle injector to make the connection stable, and a plurality of supporting beams 1601 are arranged in the motor bracket 16 to improve the supporting strength and ensure that the connection structure is not damaged; motor bracket 16 is provided with first connecting hole 1602 and second connecting hole 1603, first connecting hole 1602 is connecting through-hole 602 of motor bracket 16 and cylinder cap 15, through first connecting hole 1602 and third connecting hole 1502, motor bracket 16 is connected with cylinder cap 15, second connecting hole 1603 cooperates with motor mounting hole 105, installs motor bracket 16 on head cover member 1.

Regarding the structure and shape of the pintle connection 17, in particular:

as shown in fig. 20, the pintle connector 17 is used for connecting the piston 9 with the central plunger 3, a pintle threaded hole 1701 is formed in the middle of the pintle connector 17, and a threaded connection 905 at the bottom of the piston 9 extends into the pintle threaded hole 1701 to fix the pintle connector 17 to the piston 9; the bottom of the pintle connector 17 is formed with a plunger attachment hole 1702 and a bolt extends through the attachment portion 301 into the plunger attachment hole 1702 to attach the central plunger 3 to the pintle connector 17.

According to the motor-controlled single-component direct-current pintle injector provided by the embodiment, the motor-controlled single-component direct-current pintle injector has the function of simply adjusting the opening degree, is simple in structure and does not need a complex sealing and blocking system; the isolation mode of the balance cavity and the liquid collection cavity is simple and effective, the O-shaped ring 4 is prevented from being in a severe temperature environment and a stress environment, and the sealing effect of the O-shaped ring 4 and the working characteristic of a pintle injector are ensured; the rotary transmission mode of the driving motor 6 is converted into the linear motion transmission mode of the piston 9 through the screw rod nut 8, so that the opening of the pintle injector is adjusted through the motor; the traditional manual opening adjusting mode is eliminated, a simple method that the central plug is controlled by a motor so as to control the opening is adopted, and an external digital display can be adopted, so that the opening change is more visual.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A motor-regulated pintle injector, comprising: a head cover member (1), an injector body (2), a central plunger (3) and a motor member;

the head cover member (1) is provided with a liquid collecting cavity, the injector main body (2) is arranged in the liquid collecting cavity, a plurality of straight-flow jet holes (201) are formed in the radial direction of the injector main body (2), and propellant in the liquid collecting cavity enters a flow cavity in the injector main body (2) through the plurality of straight-flow jet holes (201);

the central plunger (3) is arranged in the flow cavity, a distance is reserved between the outer wall of the central plunger (3) and the inner wall of the injector body (2) to form an injection flow channel, a propellant nozzle is formed between the outer wall of the bottom of the central plunger (3) and the central nozzle (202) at the bottom of the injector body (2), the motor component is in transmission connection with the central plunger (3), and the motor component is configured to be capable of driving the central plunger (3) to move in the flow cavity so as to adjust the ejection area of the propellant nozzle.

2. The motor-regulated pintle injector of claim 1,

the motor component comprises a driving motor (6), a coupler (7), a rotating screw rod (13), a screw rod nut (8), a piston (9) and a pintle connecting piece (17);

a driving shaft (601) of the driving motor (6) is connected with one end of the coupler (7), the other end of the coupler (7) is connected with the rotating lead screw (13), the lead screw nut (8) is in threaded connection with the rotating lead screw (13), and the driving motor (6) is configured to be capable of driving the rotating lead screw (13) to rotate through the coupler (7) so as to drive the lead screw nut (8) to rotate along the rotating lead screw (13);

feed screw nut (8) with piston (9) are connected, piston (9) are kept away from feed screw nut (8) one end with pintle connecting piece (17) are connected, pintle connecting piece (17) are used for installing center plunger (3).

3. The motor regulated pintle injector of claim 2,

the motor component also comprises a rubber magnetic ring (10) and an air cylinder anti-collision pad (11);

the outer wall of the piston (9) is provided with a magnetic ring placing groove (901), and the rubber magnetic ring (10) is arranged in the magnetic ring placing groove (901);

a boss (902) extends outwards from the outer wall of the piston (9), and the end face, close to the central plunger (3), of the boss (902) is provided with the cylinder anti-collision pad (11);

the middle part of the piston (9) is provided with an accommodating cavity (903) for accommodating the rotary screw rod (13).

4. A motorised adjustable pintle injector as claimed in claim 3,

the motor component also comprises a connecting key (12), a cylinder sleeve (14) and a cylinder cover (15);

the driving motor (6) is provided with a connecting through hole (602), one end of the cylinder sleeve (14) is connected with the connecting through hole (602), the other end of the cylinder sleeve (14) is connected with the cylinder cover (15), and the piston (9) moves in the cylinder sleeve (14);

the outer wall of the piston (9) is provided with a connecting groove (904) used for fixing the connecting key (12), the inner wall of the cylinder cover (15) extends inwards to form an abutting edge (1504), and the abutting edge (1504) is used for limiting the movement of the connecting piece.

5. The motor regulated pintle injector of claim 4,

the motor member further comprises a motor bracket (16);

the motor bracket (16) is provided with a first connecting hole (1602) and a second connecting hole (1603), the motor bracket (16) is connected with the cylinder cover (15) through the first connecting hole (1602), and the motor bracket (16) is connected with the head cover member (1) through the second connecting hole (1603);

the motor mount (16) has a plurality of support beams (1601).

6. A motorised adjustable pintle injector as claimed in claim 3,

the pintle connecting piece (17) is provided with a pintle threaded hole (1701), the bottom of the piston (9) is provided with a threaded connecting part (905), and the threaded connecting part (905) is connected with the pintle threaded hole (1701);

the pintle connection (17) has a plunger connection bore (1702), the pintle connection (17) being connected to the central plunger (3) by the plunger connection bore (1702).

7. A motorised adjustable pintle injector as claimed in claim 5,

the top of the head cover component (1) is provided with a through hole (101) for the central plunger (3) to pass through;

the side walls of the head cover member (1) have liquid propellant inlets (102);

the bottom of the head cover member (1) is provided with a head cover threaded hole (103) for connecting with the injector body (2);

the bottom of the head cover component (1) is provided with a fixing through hole (104) for connecting with a combustion chamber;

the top of the head cover member (1) has a motor mounting hole (105) for connection with the motor bracket (16).

8. The motor-regulated pintle injector of claim 7,

the bottom opening of the injector main body (2) forms a central nozzle (202), and the injection flow channel is formed between the central nozzle (202) and the central plunger (3);

the bottom of the injector main body (2) is provided with an injector mounting hole (203), and a countersunk screw (5) penetrates through the injector mounting hole (203) and extends into the cranial cover threaded hole (103);

the injector body (2) has a positioning projection (204) at the top, the head cover member (1) has a positioning groove (106), and the positioning projection (204) protrudes into the positioning groove (106).

9. The motor regulated pintle injector of claim 8,

the top of the central plunger (3) is provided with a connecting part (301), the connecting part (301) is provided with a connecting threaded hole, and the connecting part (301) is connected with the pintle connecting piece (17) through the connecting threaded hole;

the side wall of the central plunger (3) is provided with an upper bulge (302) and a lower bulge, and the upper end face of the upper bulge (302) can be abutted with the injector body (2) to limit the movement of the central plunger (3).

10. The motor regulated pintle injector of claim 9,

the upper bulge (302) and the lower bulge are arranged at intervals to form a sealing groove (303) for mounting an O-shaped ring (4);

the bottom of the central plunger (3) is provided with a plunger inclined surface (304), and the injection flow passage is formed between the plunger inclined surface (304) and the central nozzle (202).