KR101710411B1 - Pintle injector with overdrive function and method for controlling flow of the same - Google Patents

Pintle injector with overdrive function and method for controlling flow of the same Download PDF

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Publication number
KR101710411B1
KR101710411B1 KR1020150086532A KR20150086532A KR101710411B1 KR 101710411 B1 KR101710411 B1 KR 101710411B1 KR 1020150086532 A KR1020150086532 A KR 1020150086532A KR 20150086532 A KR20150086532 A KR 20150086532A KR 101710411 B1 KR101710411 B1 KR 101710411B1
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KR
South Korea
Prior art keywords
pintle
fluid
area
passage
inner sleeve
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KR1020150086532A
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Korean (ko)
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KR20160149486A (en
Inventor
유기정
손민
구자예
Original Assignee
한국항공대학교산학협력단
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Priority to KR1020150086532A priority Critical patent/KR101710411B1/en
Publication of KR20160149486A publication Critical patent/KR20160149486A/en
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Publication of KR101710411B1 publication Critical patent/KR101710411B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/042—The valves being provided with fuel passages
    • F02M61/045—The valves being provided with fuel discharge orifices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/12—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1813—Discharge orifices having different orientations with respect to valve member direction of movement, e.g. orientations being such that fuel jets emerging from discharge orifices collide with each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies

Abstract

Disclosed is a pintle injector capable of overdrive, and a flow control method thereof, wherein the pintle injector of the present invention includes a pintle portion including a pintle rod moved in the forward and backward directions in accordance with a drive signal; An inner sleeve spaced apart from the pintle rod to form a first fluid chamber to which the first fluid is supplied, a pintle supply passage through which the first fluid passes, and a first injection outlet through which the first fluid is injected; And an outer sleeve spaced around the inner sleeve to form a second fluid chamber to which the second fluid is supplied and a second jet outlet through which the second fluid is injected, A first passage area adjusting part having a protrusion shape is provided to adjust the area of the passage and a second passage area adjusting part having a groove shape is provided on the inner circumference of the inner sleeve to adjust the area of the pintle supplying passage .

Description

TECHNICAL FIELD [0001] The present invention relates to a pintle injector capable of overdrive,

The present invention relates to an overdriveable pintle injector and a method of controlling the flow rate of the pintle injector.

In recent years, researches on sprayers have been actively conducted in various industrial and propulsion fields. As a result of these studies, coaxial, swirl type sieve injectors and pintle injectors have been developed.

Conventional pintle injectors can induce a change in propellant flow rate in a simple manner that changes the position of the pintle tip. However, the conventional pintle injector has a limitation in that it is possible to inject only the flow rate designed at a normal time, and it is difficult to easily supply the flow rate required in such an emergency situation when urgent supply of a larger flow rate is required. In other words, conventional pintle injectors could only operate within the limits of the designed thrust.

The background of the present invention is disclosed in Korean Patent Publication No. 2008-004447 (published on May 21, 2008).

The present invention relates to a pintle structure having a structure that is capable of controlling a flow rate by changing a flow path area for supplying a flow rate of a fluid in accordance with the forward and backward movement of the pintle portion and easily supplying a flow rate exceeding a designed maximum flow rate, A pintle injector and a flow control method thereof.

It is to be understood, however, that the technical scope of the present invention is not limited to the above-described technical problems, and other technical problems may exist.

According to a first aspect of the present invention, there is provided a pintle injector including a pintle portion including a pintle rod moved in a forward and backward direction according to a driving signal; An inner sleeve spaced apart from the pintle rod to form a first fluid chamber to which the first fluid is supplied, a pintle supply passage through which the first fluid passes, and a first injection outlet through which the first fluid is injected; And an outer sleeve spaced around the inner sleeve to form a second fluid chamber to which the second fluid is supplied and a second jet outlet through which the second fluid is injected, A first passage area adjusting part having a protrusion shape is provided to adjust the area of the passage and a second passage area adjusting part having a groove shape is provided on the inner circumference of the inner sleeve to adjust the area of the pintle supplying passage .

According to one embodiment of the present invention, as the pintle rod moves, the maximum projecting portion of the first flow path area regulating portion overlaps the second flow path area regulating portion with respect to the forward and backward direction, And the flow path area of the pintle supply path can be increased as the distance from the maximum depression is increased.

According to an embodiment of the present invention, in a state in which the first injection outlet is closed, the second flow path area regulating portion may be positioned relatively forward with respect to the front flow direction than the first flow path area regulating portion.

According to an embodiment of the present invention, when the maximum protrusion of the first passage area regulating portion coincides with the maximum depression of the second passage area regulating portion with respect to the anteroposterior direction, the first fluid flows through the first ejection outlet The maximum flow rate of the overdrive state that is larger than the maximum design flow rate can be injected.

According to an embodiment of the present invention, the protrusion of the first passage area regulating part protrudes along the outer periphery of the pintle rod, and the groove of the second passage area regulating part may be recessed along the inner periphery of the inner sleeve.

According to an embodiment of the present invention, the second passage area regulating portion may have a groove shape corresponding to the projection.

According to an embodiment of the present invention, the first passage area regulating section may have a semicircular shape having a convex section and the second passage area regulating section may have a semicircular shape having a concave section.

According to an embodiment of the present invention, the pintle portion includes a pintle portion provided at a front end portion of the pintle rod to provide the first injection outlet, which is formed in accordance with the forward and backward movement of the pintle rod, between the front portion of the inner sleeve and the front portion of the inner sleeve. Tip. ≪ / RTI >

According to one embodiment of the present application, a pintle injector according to the first aspect of the present invention is characterized in that the pintle rod is disposed in a through-hole, covers the rear surface of the inner sleeve, and supplies the first fluid to the first fluid chamber And a cover on which the fluid supply port is formed.

According to an embodiment of the present invention, the outer sleeve may include a second fluid supply port formed to penetrate an outer circumferential surface thereof to supply the second fluid to the second fluid chamber.

According to an embodiment of the present invention, an annular orifice for spraying the second fluid forward may be formed between the inner sleeve and the outer sleeve.

According to a second aspect of the present invention, there is provided a method for controlling a flow rate of a pintle injector according to the first aspect of the present invention, comprising the steps of: (a) To increase the opened passage area of the first injection outlet formed between the front portion of the inner sleeve and the pintle tip of the pintle rod or to move the front portion of the inner sleeve and the pintle rod of the pintle rod, Reducing an opened flow area of the first injection outlet formed between the tips; And (b) when the first fluid is to be injected in accordance with the flow rate of the overdrive state exceeding the maximum design flow rate in the normal operation state, the maximum protrusion of the first flow- And moving the pintle rod such that the pintle rod is overlapped with the front-rear direction.

According to an embodiment of the present invention, in the step (b), when it is necessary to inject the first fluid to maximize the flow rate of the overdrive state, the maximum protrusion of the first flow- The pintle rod can be moved so as to coincide with the maximum depression of the regulating portion and the forward and backward directions.

According to one of the above-mentioned tasks, the pintle injector used in the aerospace industry and various fields is improved, so that the pintle injector which injects the flow rate designed at a normal flow rate urgently requires an additional flow rate It is possible to provide a pintle injector which can easily supply the required flow rate.

In addition, according to any one of the above-described tasks, there is an advantage that an injector operating at a flow rate designed in a general environment can secure a thrust through supply of additional flow rate in order to escape from an emergency situation.

According to any one of the above-mentioned tasks, since the additional flow rate can be obtained only when necessary through the structural modification of the pintle portion, it is possible to reduce the waste of designing to supply a large amount of flow rate from the beginning of the design for an emergency situation .

1 is a three dimensional view of a pintle injector according to an embodiment of the present invention;
2 is a cutaway perspective view of a portion of an injector pintle injector according to an embodiment of the present invention;
3 is a cross-sectional view of a pintle injector according to one embodiment of the present invention;
FIG. 4 is a cross-sectional view illustrating a state in which the pintle portion moves downward in the pintle injector according to one embodiment of the present invention.
5 is a cross-sectional view illustrating a state in which the pintle portion is moved in a downward direction according to the maximum design flow rate of the pintle injector according to an embodiment of the present invention.
6 is a cross-sectional view of a pintle injector according to an embodiment of the present invention when operated as an overdrive.
FIGS. 7A through 7D are diagrams illustrating the state of the pintle injector according to one embodiment of the present invention according to the opening state of the first injection outlet. FIG.
8 is a graph showing a change in the supply area of the first fluid according to the opening degree of the first injection outlet of the pintle injector according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It should be understood, however, that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, the same reference numbers are used throughout the specification to refer to the same or like parts.

Throughout this specification, when a part is referred to as being "connected" to another part, it is not limited to a case where it is "directly connected" but also includes the case where it is "electrically connected" do.

Throughout this specification, when a member is " on " another member, it includes not only when the member is in contact with the other member, but also when there is another member between the two members.

Throughout this specification, when an element is referred to as "including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise.

The terms "about "," substantially ", etc. used to the extent that they are used throughout the specification are intended to be taken to mean the approximation of the manufacturing and material tolerances inherent in the stated sense, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure. The word " step (or step) "or" step "used to the extent that it is used throughout the specification does not mean" step for. Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front view of a pintle injector according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of a pintle injector according to an embodiment of the present invention. Fig.

1 to 3, the pintle injector may include a fin portion 100, an inner sleeve 200, and an outer sleeve 300. In addition, the pintle injector may include a lid 400.

The pin frame portion 100 includes a pintle rod 104 which is moved in the forward and backward direction in accordance with a driving signal. Illustratively, the pintle rod 104 may be physically controlled and driven via a motor and a ball screw in accordance with a drive signal. The pintle part 100 may include a first flow path area adjusting part 106 having a protrusion shape on the outer periphery of the pintle rod 104. In addition, the pintle portion 100 may include a pintle tip 102. In addition, the fin portion 100 is inserted into the inner sleeve 200 so as to be movable in the up and down direction, so that the first fluid flow path supplied from the outside and the first injection outlet 110 < / RTI > Specifically, the fin portion 100 forms a first fluid flow path between the outer circumferential surface and the inner circumferential surface of the inner sleeve 200, and a first fluid chamber (not shown) surrounded by the lid 400 and the inner circumferential surface of the inner sleeve 200 130 can be formed.

The pintle tip 102 is provided at the front end portion of the pintle rod 104 so as to provide a first injection outlet 110 formed in accordance with the forward and backward movement of the pintle rod 104 between the front end portion of the inner sleeve 200 and the front end portion of the inner sleeve 200. [ . 2, the pintle tip 102 has a pintle sloped surface 108 formed to extend from the front portion of the pintle portion 100 and is disposed between the pintle sloped surface 108 and the bottom portion of the inner sleeve 200 The first injection outlet 110 can be formed. For reference, the 12 o'clock direction of Fig. 3 may be rearward and the 6 o'clock direction may be forward.

In an embodiment of the present invention, the first injection outlet 110 may be opened or closed in accordance with the upward / downward movement of the fin portion 100.

The pintle rod 104 can move the pintle tip 102 in the forward and backward directions (up and down direction in FIG. 3) based on an external driving signal.

The end of the pintle rod 104 may be coupled to the cover 400 and may be connected to a driving unit (not shown) outside the pintle rod 104.

The first passage area regulating portion 106 may protrude from the outer periphery of the pintle rod 104. In addition, in one embodiment of the present invention, the first passage area regulating portion 106 may have a protrusion shape having a size corresponding to the groove corresponding to the second passage area regulating portion 202 described below.

The inner sleeve 200 includes a first fluid chamber 130 through which the first fluid is supplied, a pintle supply passage 135 through which the first fluid passes, and a first injection outlet 110 through which the first fluid is injected. And the rod 104 is surrounded with a gap therebetween. Referring to FIG. 3, the first fluid chamber 130 may be formed to be surrounded by the outer circumferential surface of the inner sleeve 200, the cover 400, and the pintle rod 104.

3, the inner sleeve 200 may have a rear portion (reference upper surface in FIG. 3) open and a portion of the rear portion connected to the cover 400. Referring to FIG.

The inner sleeve 200 has a first injection outlet 110 formed between the bottom portion and the pintle inclined surface 108 of the pintle tip 102 to be opened and closed in accordance with the movement of the pintle portion 100 in the longitudinal direction, The flow path of the first fluid can be formed between the outer circumferential surface of the fin portion 100 and the outer circumferential surface of the fin portion 100. 2 and 3, the bottom portion of the inner sleeve 200 may have a shape that is inclined to correspond to the pintle slope 108.

2 and 3, a first fluid chamber 130 surrounded by the inner circumferential surface of the inner sleeve 200, the cover 400, and the outer circumferential surface of the fin portion 100 is provided on the inner upper side of the inner sleeve 200 .

The inner sleeve 200 according to an embodiment of the present invention includes a first flow path area adjusting part 106 and a second flow path area adjusting part 202 to adjust the flow path area of the pintle supply path 135 can do. The second passage area regulating portion 202 may be formed to have a groove shape on the inner circumference of the inner sleeve 200.

2 and 3, the protrusion of the first passage area regulating part 106 may protrude along the outer periphery of the pintle rod 104. As shown in FIG. In addition, the grooves of the second passage area regulating portion 202 may be recessed along the inner periphery of the inner sleeve 200.

The second passage area regulating portion 202 may have a groove shape corresponding to the projection of the first passage area regulating portion 106. 3, the second passage area regulating part 202 may have a groove shape having a size capable of engaging with the first passage area regulating part 106 having a protrusion shape. Illustratively, the first passage area regulating portion 106 may have a semicircular shape with a convex section, and the second passage area regulating portion 202 may have a semicircular shape with a concave section. In this case, the maximum projecting portion of the first passage area regulating portion 106 may be a central portion thereof, and the maximum depression portion of the second passage area regulating portion 202 may be a central portion thereof. By regulating the amount of protrusion (protruding radius) of the maximum protrusion of the first flow path area regulating portion 106, the flow rate passing through the pintle supply flow path 135 during normal operation (normal) can be adjusted, By controlling at least one of the protruding amount (protruding radius) of the maximum protruding portion of the regulating portion 106 and the recessed amount (recessing radius) of the maximum depressed portion of the second flow path area regulating portion 202, 135, respectively.

2 and 3, in a state in which the first injection outlet 110 is closed, the second flow path area regulating portion 202 has a first flow path area regulating portion 106) relative to each other (in the reference lower direction in Fig. 3).

The second fluid chamber 140 and the second ejection outlet 120 may be formed in the space between the outer circumferential surface of the inner sleeve 200 and the outer sleeve 300. 3, a space between the outer circumferential surface of the inner sleeve 200 adjacent to the front surface of the inner sleeve 200 and the inner circumferential surface of the front end of the outer sleeve 300 is supplied from the outside of the second fluid, A second jetting outlet 120 for jetting a second fluid may be formed. Referring to FIGS. 1 and 2, the second injection outlet 120 may be an annular orifice that injects a second fluid forwardly between the inner sleeve 200 and the outer sleeve 300.

The outer sleeve 300 also surrounds the inner sleeve 200 to form a second fluid chamber 140 to which the second fluid is supplied and a first injection outlet 120 to which the second fluid is injected. Referring to FIG. 3, the outer sleeve 300 may be coupled to a front portion (reference portion in FIG. 3) of the cover 400 at a rear portion thereof (reference upper surface in FIG. 3).

In addition, the outer sleeve 300 may include a second fluid supply port formed to penetrate the outer circumferential surface thereof to supply the second fluid to the second fluid chamber 140.

On the other hand, the lid 400 includes a pintle rod 104 penetratingly arranged to cover the rear surface (reference upper surface in Fig. 2) of the inner sleeve 200, and a first fluid chamber 130 for supplying a first fluid to the first fluid chamber 130 And a fluid supply port 160 are formed. 3, the upper surface of the inner sleeve 200 and the upper surface of the outer sleeve 300 may be coupled to the bottom surface of the lid 400. As shown in FIG. Referring to FIG. 3, the pintle rod 104 of the fin portion 100 may be coupled to the center portion of the lid 400.

The flow of the first fluid and the second fluid of the pintle injector having the above-described structure will be described below as an example.

The first fluid is supplied to the first fluid chamber 130 through the first fluid supply port 160 and the first fluid supplied to the first fluid chamber 130 flows into the pintle supply path 135 Can be injected through the first injection outlet 110 in the form of a sheet.

The second fluid is supplied to the second fluid chamber 140 through the second fluid supply port 150 and the second fluid supplied to the second fluid chamber 140 is supplied to the second injection port 120 Orifice) in the form of an annular sheet.

The first fluid ejected through the first ejection outlet 110 and the second fluid ejected through the second ejection outlet 120 may be externally encountered and may be split and mixed after being collided (see FIGS. 4 to 6 ). In this case, the second injection outlet 120 in the form of an annular orifice is fixed, and the fluid injected into the first injection outlet 110 is controlled in accordance with the movement of the fins 100 in the forward and backward directions .

Hereinafter, a process of controlling the flow rate of the first fluid by the pintle injector according to the forward and backward movement of the pintle portion 100 will be described with reference to the accompanying drawings.

FIG. 4 is a cross-sectional view illustrating a state in which the pintle 100 is moved in a downward direction in the pintle injector according to an embodiment of the present invention, and FIG. 5 is a cross-sectional view of the pintle injector according to an embodiment of the present invention, FIG. 6 is a cross-sectional view of the pintle injector according to the embodiment of the present invention when it operates as an overdrive. FIG.

4, when the pintle part 100 moves forward, the pintle tip 102 also moves forward to open the first injection outlet 110, so that the pintle tip 102, which is on the flow path of the first fluid, 1 fluid is injected to the outside through the first injection outlet 110 formed between the pintle inclined face 108 of the pintle tip 102 and the bottom face portion of the inner sleeve 200. At this time, the first fluid supply flow rate of the pintle injector and the mixing ratio of the first fluid and the second fluid are determined by the area between the first flow path area regulating portion 106 of the fin portion 100 and the inner peripheral surface of the inner sleeve 200 .

5 is a cross-sectional view showing the pintle tip 102 opened at the maximum design flow rate. As shown in FIG. 5, when the pin-frame portion 100 moves in accordance with the maximum design flow rate, the flow path area between the maximum projecting portion of the first passage area adjusting portion 106 and the inner peripheral surface of the inner sleeve 200 The pintle portion 102 is moved in accordance with the movement of the pintle portion 100 when the pintle portion 100 is moved to the same state as the flow path area of the first injection outlet 110 So that the opening degree of the first injection outlet 110 increases corresponding to the maximum design flow rate. The first fluid is supplied to the first flow path area adjusting member 106 and the inner sleeve 200 of the pintle portion 100 as the first fluid is increased in accordance with the downward movement of the pintle portion 100, And is injected through the first injection outlet 110 to the outside.

6 is a cross-sectional view showing a state of the pintle injector according to an embodiment of the present invention in an overdrive operation. 6, when the pin fence 100 is moved for overdrive operation, for example, the central portion of the first passage area regulating portion 106 is moved in the direction of the groove corresponding to the second passage area regulating portion 202 When the pintle portion 100 is moved so as to reach the center portion, the flow path area between the center of the first flow-area adjustment portion 106 and the center of the second flow- The flow rate of the refrigerant is increased. In addition, as the pintle portion 100 moves, the pintle tip 102 moves, and the opening of the first injection outlet 110 also increases to the maximum.

In this way, since the flow passage area is increased more than that at the time of securing the maximum design flow rate at the normal time, an additional flow rate exceeding the maximum design flow rate at normal times can be ensured. At the same time, the opening degree of the first injection outlet 110 is also maximized So that the pintle injector according to one embodiment of the present invention operates as an overdrive.

As described above, according to the movement of the pintle rod 104, the maximum protruding portion which is the most protruded portion of the protrusion shape of the first flow path area regulating portion 106 is located in the second flow path area regulating portion 202 with respect to the front- The first fluid can be designed to be injected at the maximum design flow rate through the first injection outlet 110 when the first fluid is located close to the rear end of the groove shape of the groove or when it is located at the rear end. The pintle rod 104 is moved so that the maximum protrusion of the first passage area regulating part 106 overlaps the second passage area regulating part 202 with respect to the front and rear direction. The passage area of the pintle supply passage may be increased and the first injection outlet 110 may be further opened as the maximum protrusion of the pintle supply passage approaches the maximum depression of the second passage area regulating portion 202. [ When the maximum projecting portion of the first passage area regulating portion 106 coincides with the maximum depression of the second passage area regulating portion 202 with respect to the front-rear direction, the first fluid flows through the first injection outlet to the maximum It can be injected with the maximum thrust of the overdrive state which is larger than the design flow rate. When the maximum projecting portion of the first passage area regulating portion 106 coincides with the maximum depression of the second passage area regulating portion 202 with respect to the front-rear direction, the first injection outlet 110 also has a maximum design flow rate The maximum thrust of the overdrive state required in an emergency situation can be realized. That is, according to the present invention, it is possible to obtain a higher thrust instantaneously than a thrust designed with a maximum thrust by supplying more propellant than usual.

On the other hand, the change in the supply area of the first fluid according to the degree of opening of the first injection outlet 110 will be described with reference to Figs. 7A to 7D and Fig.

FIGS. 7A through 7D are views showing the state of the pintle injector according to one embodiment of the present invention according to the opening state of the first injection outlet 110, and FIG. 8 is a cross-sectional view of the first pintle injector according to one embodiment of the present invention, A graph showing the change in the supply area of the first fluid according to the degree of opening of the injection outlet 110;

7A is the supply area required when the pintle injector according to one embodiment of the present invention injects the propellant (first fluid) at the maximum design thrust. 7A shows the position of the pintle 100 when the pintle injector according to one embodiment of the present invention injects a flow rate lower than the design flow rate. In this case, since the area d is smaller than the area a, the flow rate supply area of the first fluid in the state of Fig. 7A becomes d.

Increasing the opening of the first injection outlet 110 of the pintle injector in order to further supply the flow rate is as shown in FIG. 7B. In FIG. 7B, the minimum area of the pintle supply passage 135 and the area of the first ejection outlet 110 are equal to each other. Here, the area ⓕ is an area where the area ⓓ of Fig. 7A is further increased as the opening degree of the first injection outlet 110 increases. Accordingly, the state shown in FIG. 7B may be a state in which the flow rate of the pintle injector according to one embodiment of the present invention is supplied by the maximum design flow rate. That is, the state of FIG. 7B is a state in which the pintle injector exhibits the maximum thrust in a normal operating state.

The pintle portion 100 is further moved forward as shown in Fig. 7C in order to supply a larger supply flow rate instantaneously while the maximum design flow rate is being supplied in the state as shown in Fig. 7B. 7B, the area of the first injection outlet 110 becomes larger than that of FIG. 7B, so that the minimum area of the pintle supply passage 135 is the smallest area as a whole. Accordingly, the flow rate of the propellant supplied is determined by the area ratio, and the pintle injector according to one embodiment of the present invention provides more flow than the designed flow rate. That is, the state of FIG. 7C indicates that the pintle injector is in the overdrive state It can be said that it is settled.

On the other hand, FIG. 7D shows the state of the pintle injector in which the maximum thrust in the overdrive state is provided, wherein the minimum supply line area in this state is the area and the area. If this state is maintained for a long time, the consumption of the flow rate is significant. Therefore, it is preferable to return to the state of Fig. 7A or the state of Fig. 7B after holding for a short time.

On the other hand, the area of the graph in Fig. 8 shows the respective minimum areas of Figs. 7A to 7D.

First, the minimum area of the finture injector flow path in the state of FIG. 7A is determined by d. This area corresponds to the state of (1) in the graph of FIG. 8 as the state increases gradually as the pintle opening degree increases.

As the pintle opening degree increases, the area D is increased, and the increasing area becomes equal to the area A (in FIG. 7B, the area A is equal to the area A.), which is the state shown in FIG. 7B. In this case, The supply area does not change, and therefore corresponds to the state (2) in the graph of Fig.

In the case of a general pintle injector, since there is no flow area adjusting portion for overdriving, even if the opening degree of the first injection outlet 110 increases, there is no further change in the area. However, in the case of the pintle injector according to one embodiment of the present invention, since there is a passage area adjusting unit for overdrive, the state shown in Fig. At this time, the increasing area is the area shown in Fig. 7C, and this area is the same as in Fig. 8C, and is the minimum area of the flow path.

On the other hand, even if there is a flow control member for overdrive, there is a maximum flow rate that can be supplied. In this case, the pintle injector according to one embodiment of the present invention becomes the state shown in FIG. 7D. As shown in Fig. 7 (d), when the flow regulating member for overdrive reaches the maximum thrust state, the state shown in Fig. The minimum area at this time is the area ⓗ and the area ⓘ in FIG. 7D.

The flow control method using the pintle injector according to one embodiment of the present invention will now be described with reference to the above description.

The method of controlling a flow rate of a pintle injector according to an embodiment of the present invention is a method of controlling a flow rate of a pintle injector by advancing a pintle rod to increase an opened flow area of a first injection outlet formed between a front portion of the inner sleeve and a pintle tip of a pintle rod, (S110) of reducing the opened flow area of the first injection outlet formed between the front portion of the inner sleeve and the pintle tip of the pintle rod by reversing the load (S110) and exceeding the maximum design flow rate in the normal operating state (S120) of moving the pintle rod so that the maximum protrusion of the first flow-passage-area regulating portion overlaps the second flow-passage-area regulating portion with respect to the back-and-forth direction when the first fluid needs to be injected in accordance with the overdrive- . ≪ / RTI >

If it is necessary to inject the first fluid to maximize the flow rate of the overdrive state in step S120, the maximum protrusion of the first flow-area regulating section and the maximum depression of the second flow- . As described above, when the pintle load is advanced and the flow passage area of the pintle supply flow passage becomes equal to the flow passage area of the first injection outlet in step S110, 1 fluid can be injected.

It will be understood by those of ordinary skill in the art that the foregoing description of the embodiments is for illustrative purposes and that those skilled in the art can easily modify the invention without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

It is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. .

100: pin-
102: pintle tips
104: pintle rod
106: First flow area regulating section
108: pintle slope
110: 1st injection outlet
120: 2nd injection outlet
130: first fluid chamber
135: pintle supply channel
140: second fluid chamber
150: second fluid supply port
160: first fluid supply port
200: Inner sleeve
202: second flow-area regulating section
300: outer sleeve
400: cover

Claims (13)

In the pintle injector,
A pintle portion including a pintle rod which is moved in a forward and backward direction in accordance with a driving signal;
An inner sleeve spaced apart from the pintle rod to form a first fluid chamber to which the first fluid is supplied, a pintle supply passage through which the first fluid passes, and a first injection outlet through which the first fluid is injected; And
A second fluid chamber to which a second fluid is supplied and an outer sleeve surrounding the inner sleeve to form a second jet outlet through which the second fluid is jetted,
Wherein the pintle rod has a first flow path area adjusting portion formed on an outer circumference of the pintle rod and protruding along the outer periphery of the pintle rod to adjust the area of the pintle supply flow path,
The inner circumference of the inner sleeve is provided with a second flow path area regulating portion formed in a groove shape recessed along the inner circumference of the inner sleeve to regulate the area of the pintle supply path,
Wherein the second passage area regulating portion is located relatively forward of the first passage area regulating portion with respect to the front and rear direction in a state in which the first injection outlet is closed,
Wherein the flow passage area between the maximum protrusion of the first flow passage area regulating part and the inner circumferential face of the inner sleeve is a flow passage area corresponding to the maximum design flow rate in a normal operation state,
When the pintle rod is advanced such that the opened passage area of the first injection outlet becomes equal to the passage area between the maximum projection of the first passage area regulating part and the inner peripheral surface of the inner sleeve, To a maximum design flow rate in a normal operating state,
When the pintle rod is advanced such that a maximum protrusion of the first flow-passage-area regulating portion overlaps with the second flow-passage-area regulating portion with respect to the fore-and-aft direction, the minimum area between the first flow- Wherein the first fluid passage has a minimum area in the entire pintle supply passage and the first injection outlet and the first fluid flows in a normal operation state according to a minimum area between the first passage area regulation part and the second passage area regulation part The flow rate of the overdrive state is exceeded,
Wherein the minimum area between the first passage area regulating part and the second passage area regulating part is set such that the maximum protrusion of the first passage area regulating part overlaps with the second passage area regulating part with respect to the front- Increases as it approaches the maximum depression of the flow path area regulating portion,
The pintle rod is advanced such that the maximum protrusion of the first passage area regulating part coincides with the maximum depression of the second passage area regulating part with respect to the front-rear direction, the first fluid is injected at the maximum flow rate of the overdrive state In, pintle injector. delete delete delete delete The method according to claim 1,
Wherein the second flow path area regulating portion has a groove shape corresponding to the projection. delete The method according to claim 1,
Wherein the pintle portion further comprises a pintle tip provided at a front end portion of the pintle rod to provide the first injection outlet formed in accordance with the forward and backward movement of the pintle rod between the front portion of the inner sleeve and the front portion of the inner sleeve. Pintle injector. The method according to claim 1,
Further comprising a cover on which the pintle rod is disposed and which covers a rear surface of the inner sleeve and has a first fluid supply port formed therein for supplying the first fluid to the first fluid chamber. The method according to claim 1,
Wherein the outer sleeve includes a second fluid supply port formed to penetrate the outer circumferential surface to supply the second fluid to the second fluid chamber. The method according to claim 1,
Wherein an annular orifice is formed between the inner sleeve and the outer sleeve to inject the second fluid forward. A flow control method for a pintle injector according to claim 1,
(a) advancing the pintle rod to increase an opened passage area of a first injection outlet formed between a front portion of the inner sleeve and a pintle tip of the pintle rod, or moving the pintle rod backward to advance the inner sleeve Reducing an opened flow area of the first injection outlet formed between the front portion and the pintle tip of the pintle rod; And
(b) when the first fluid is to be injected in accordance with the flow rate of the overdrive state exceeding the maximum design flow rate in the normal operation state, the maximum protrusion of the first flow- And moving the pintle rod so that the pintle rod is overlapped with the direction of the pintle rod. 13. The method of claim 12,
In the step (b), when it is necessary to inject the first fluid to maximize the flow rate of the overdrive state, the maximum projecting portion of the first flow-area regulating portion and the maximum recessed portion of the second flow- And the pintle rod is moved so as to coincide with the pintle rod.
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