JPH0791888A - Missile launching device - Google Patents

Abstract

PURPOSE:To enable a safety characteristic to be assured in the case of occurrence of back-fire by a method wherein when liquid fuel such as LP gas or the like is used to launching a missile, if a pressure within a fuel chamber acting against a rear surface of a front end part exceeds a specific pressure due to back-fire, a safety valve is operated to advance in a rearward direction. CONSTITUTION:A launching device in which liquid fuel of a fuel chamber 8 is injected into a combustion chamber 1 and the fuel is ignited to launch a missile 7 installed at a cannon 20 with combustion gas pressure is constructed such that a safety valve head part 5 is formed with a second piston member 31 having a discharging hole 22 communicating between the combustion chamber 1 and the fuel chamber 8, and then a first piston member 30 is biased forwardly with a biasing means 9 against the piston member 31. A projection 4a at a front end of the first piston member 30 is provided with the safety valve 4 for opening or closing a discharging hole 22. This safety valve 4 is constructed such that the second pistoon member 31 is advanced against the biasing means 9 and toward the first piston member 30 when a high fuel chamber pressure P2 occurs with the back-fire, and then the safety valve releases it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projectile launching device having a flashback safety function.

[0002]

2. Description of the Related Art Conventionally, various projectile launching apparatuses have been proposed for launching projectiles using liquid fuel (for example, LP). In this type of projectile launching device, a fuel injection piston that partitions the combustion chamber and the fuel chamber is provided inside the injection mechanism main body that is connected to the barrel, and at the time of start-up, fuel injection between the fuel injection piston and the injection mechanism main body is performed. After the gap is closed and divided into the fuel chamber and the combustion chamber, the combustion chamber is ignited by the igniter, and the fuel injection piston is relatively retracted by the combustion gas pressure generated by the combustion, and the fuel is injected. An injection gap is created, and the liquid fuel in the fuel chamber is injected into the combustion chamber at a predetermined ratio from this gap, and the projectile in the barrel is fired by the combustion gas pressure generated in the combustion chamber.

[0003]

However, in such a conventional projectile launcher, when a flashback phenomenon occurs in which a flame enters the fuel chamber from the combustion chamber during combustion,
There is a technical problem that the liquid fuel in the fuel chamber instantly burns in a closed state causing a detonation, which damages the projectile launcher and is dangerous.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional technical problems.
The configuration of the invention of (1) comprises an injection mechanism main body 2 connected to the rear end of the barrel 20, and a fuel injection piston 3 slidable along the inner surface 2a of the injection mechanism main body 2 in the central axis direction. In the combustion chamber 1 connected to the fuel injection piston 3, the fuel injection gap 6 at the tip of the fuel injection piston 3 is opened by the backward movement due to the pressure acting on the pressure receiving area difference between the front and rear surfaces of the fuel injection piston 3, The liquid fuel in the fuel chamber 8 behind the injection gap 6 is injected into the combustion chamber 1, the injected liquid fuel is burned to generate a predetermined combustion gas pressure, and the projectile 7 loaded in the barrel 20 is injected. And a first piston body 30 in which a fuel injection piston 3 is slidably fitted in the injection mechanism body 2, and a first piston body 30 slidable in a central axis direction. The safety valve head at the front end is inserted into the The outer surface of 5 is in close contact with the inner wall 2a of the injection mechanism main body 2 so as to close the fuel injection gap 6, and is formed in the safety valve head portion 5, and the discharge hole 22 that connects the combustion chamber 1 and the fuel chamber 8 is formed. Second piston body 31 having
A first urging means 9 for urging the first piston body 30 forward with respect to the second piston body 31, and a first piston body 30.
Is provided with a safety valve 4 for opening and closing the rear portion of the discharge hole 22, and at least a high fuel chamber pressure P ₂ is generated by flashback, so that the urging force by the first urging means 9 is resisted. The second piston body 31 is moved forward with respect to the first piston body 30 to open the safety valve 4, and the front end rear surface 31z of the second piston body 31 is set. It is a device. According to a second aspect of the invention, the first urging means 9 is provided with a safety valve pressurizing chamber 21 that is partitioned by the first piston body 30 and the second piston body 31 and stores a fluid. 21. The projectile launching apparatus according to claim 1, wherein 21 is maintained at a predetermined pressure by an opening valve 16 that opens at a set pressure. According to the third aspect of the invention, the deformed cylinder portion having the large diameter cylinder portion 31m and the small diameter cylinder portion 31n in the second piston body 31 is provided with the large diameter piston portion 10a and the small diameter piston portion 10b. The force piston 10 is slidably provided, the front portion of the large-diameter cylinder portion is communicated with the combustion chamber 1 through the opening portion 31b, and the liquid passage 31 of the rear portion of the small-diameter cylinder portion 31n is provided.
The projectile launching device according to claim 1 or 2, wherein the release valve 16 is acted upon at t to apply a set pressure to the release valve 16. According to a fourth aspect of the present invention, the pressure liquid in the liquid passage 31t acts on the safety valve pressurizing chamber 21 so as to apply the biasing force of the first biasing means 9. This is a projectile launcher.

[0005]

According to the first aspect of the present invention, the flame of the combustion chamber 8 enters the fuel chamber 8 through the fuel injection gap 6 to cause a flashback phenomenon, and the liquid fuel in the fuel chamber 8 burns, so that the fuel chamber When the pressure inside 8 rises above a predetermined pressure, the safety valve 4 operates. That is, when the fuel chamber pressure P ₂ acting on the rear surface 31z of the front end portion due to flashback exceeds the holding pressure by the urging force of the first urging means 9 that closes the safety valve 4, the safety valve 4 operates to open, The fuel chamber pressure P ₂ is released to the combustion chamber 1 side.

In this way, the pressure in the fuel chamber 8 is surely released to the combustion chamber 1 and then to the barrel 20.
An abnormal rise in the pressure of the fuel chamber 8 is prevented, and safety during flashback is ensured. The pressure inside the fuel chamber 8 is released to the combustion chamber 1 and then to the barrel 20, so that the projectile 7 in the gun cavity flies.

The opening operation of the safety valve 4 can be obtained even during normal combustion. At the time of normal combustion, when the fuel chamber pressure P ₂ exceeds a predetermined pressure, the safety valve 4 is opened and the fuel injection area is expanded, so the fuel in the fuel chamber 8 is also injected into the combustion chamber 1 from this portion, and the combustion energy is increased. Will increase. Then, the dimensions of each part are set so that the safety valve 4 is positively opened even during normal combustion, and the safety valve operating pressure is arbitrarily set so that the safety valve 4 functions as the fuel injection gap 6, and in addition to the safety function. It is also possible to function as a fuel control mechanism that controls combustion.

According to the invention of claim 2, the first urging means 9
Is provided with a safety valve pressurizing chamber 21 that is partitioned by the first piston body 30 and the second piston body 31 and contains a fluid, and the safety valve pressurizing chamber 21 is predetermined by the open valve 16 that opens at a set pressure. Since the pressure is maintained, the opening operation of the safety valve 4 is obtained when the safety valve pressurizing chamber 21 exceeds the set pressure of the opening valve 16. After the flying body 7 flies, when the safety valve 4 is closed and returned to the original state by the urging force of the first urging means 9, the safety valve pressurizing chamber 21 is restored to the original volume.

According to the third aspect of the invention, the deformed cylinder portion in the second piston body 31 is provided with the boosting piston 10 slidably, and the front portion of the large diameter cylinder portion is burned by the opening portion 31b. The small diameter cylinder part 31n is communicated with the chamber 1.
Since the opening valve 16 is caused to act on the rear part of the liquid passage 31t and the setting pressure is applied to the opening valve 16, the setting pressure of the opening valve 16 is applied in relation to the pressure of the combustion chamber 1. As a result, the safety valve 4 does not open due to the pressure increase in only the fuel chamber 8, and the reliability of the operation of the safety valve 4 is improved.

According to the fourth aspect of the present invention, since the pressure liquid in the liquid passage 31t acts on the safety valve pressurizing chamber 21 so as to apply the urging force of the first urging means 9, the combustion chamber 1 The pressure of the safety valve pressurizing chamber 21, that is, the urging force of the first urging means 9 is applied in relation to the pressure of. As a result, the safety valve 4 does not open due to the pressure increase in only the fuel chamber 8, and the safety valve 4 does not operate.
The reliability of the operation of is further improved.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of a projectile launching apparatus having a flashback safety function according to the present invention. In the drawings, reference numeral 20 indicates a barrel, which has a barrel 20a into which the projectile 7 is loaded and which is integrally formed by being connected to the injection mechanism body 2. Inside the injection mechanism main body 2, a cavity portion having an inner wall composed of a tapered portion 2a, a large diameter portion 2b, a step surface portion 2c, and a guide hole 2d, which gradually expands in diameter toward the rear from the front end side, penetrates. Has been formed.
An igniter 50 is connected to the front end of the tapered portion 2a, and a fuel injection passage 52 to which an opening / closing valve 51 is attached is opened in the step surface portion 2c.

A fuel injection piston 3 is housed inside the injection mechanism body 2 so as to be slidable in the central axis direction.
The fuel injection piston 3 is urged forward by the second urging means 25, and the safety valve head portion 5 at the front end portion normally closes the fuel injection gap 6 between the fuel injection piston 3 and the taper portion 2a. The fuel injection piston 3 has a cylindrical first piston body 30.
And a cylindrical second piston body 31 which is slidably inserted in the first piston body 30 in the central axis direction.

As shown in FIG. 2, the outer surface of the first piston body 30 is formed at the front end, and the tapered portion 30a is formed so that the diameter gradually increases rearward.
0b and a cylindrical surface portion 30c connected to each other, and the inner surface of the large diameter portion 30j and the annular step surface 30 are sequentially arranged from the front end side.
f, small-diameter portion 30e, boost pressure receiving surface 3 composed of annular step surface
0d and a large-diameter portion 30g, a liquid passage 30h is bored to connect the middle portion of the large-diameter portion 30g and the rear end of the cylindrical surface portion 30c, and the annular step surface 30f and the rear end portion of the cylindrical surface portion 30c are formed. A liquid passage 30i communicating with and is provided. An annular protrusion 4a is formed between the tapered portion 30a and the large diameter portion 30j. Seal ring 4 embedded in the small diameter portion 30e
0 is a small-diameter cylindrical surface portion 31 of the second piston body 31 described later.
Maintain liquid tightness with e. The liquid passage 30h is connected to a liquid passage 47 attached with an opening / closing valve 46 as shown in FIG.
It has a function of supplying and discharging hydraulic oil in the safety valve pressurizing chamber 21, which will be described later.

As shown in FIG. 3, the second piston body 31 has a front surface forming a spherical surface portion 31a and a front end portion forming a safety valve head portion 5 having an outer shape that gradually expands rearward. An annular cross section 31 which is an outer surface continuing from the portion 5 is a rear surface of a front end portion which partitions the fuel chamber 8 described later in order from the front end side.
z, a wedge-shaped annular space 31c formed inside the annular cross section 31z, an annular step surface 31d, a small-diameter cylindrical surface portion 31e, and a boost pressure receiving surface 13 including an annular step surface.
The annular space 31c has a medium-diameter portion 31g, an annular step surface 31h, and a large-diameter portion 31i, and the annular space 31c has a tapered outer peripheral surface 31j that gradually increases in diameter toward the rear and an inner peripheral surface 31k having a medium diameter.
And an annular front surface 31l, and the front surface 31l is open to the spherical surface portion 31a by the plurality of emission holes 22.
The seal ring 41 embedded in the inner peripheral surface 31k of the annular space 31c maintains liquid tightness with the large diameter portion 30j of the first piston body 30, and the seal ring 42 embedded in the medium diameter portion 31g is the first Liquid tightness is maintained between the piston body 30 and the large diameter portion 30g.

Further, at the front of the second piston body 31, there is a deformed cylinder portion consisting of a large-diameter cylinder portion 31m and a small-diameter cylinder portion 31n whose front side communicates with the spherical surface portion 31a through an opening 31b, in the direction of the central axis. The deformed cylinder portion has a large-diameter piston portion 10a having a diameter B and a diameter C.
The deformed booster piston 10 including the small-diameter piston portion 10b is slidably fitted, and the booster piston 10 is constantly urged forward by the spring 43, and in the normal state, the large-diameter piston portion 10a The front edge is in contact with the front stopper portion 31r of the large-diameter cylinder portion 31m to take the forward position. The back of the large-diameter piston portion 10a communicates with the annular step surface 31d through the through hole 31y, and through the annular space between the pair of annular step surfaces 31d and 30f in the assembled state and the liquid passage 30i, It communicates with the atmosphere. Further, the elastic force of the spring 43 may be weak enough to return the boosting piston 10.

A valve chamber 31s is formed in the rear portion of the second piston body 31, and the front end of the valve chamber 31s and the rear end of the small diameter cylinder portion 31n communicate with each other through a liquid passage 31t, so that the valve chamber 3
The valve seat 31u at the rear end of 1s communicates with the boost pressure receiving surface 13 through the liquid passage 31v. Further, a liquid passage 31f branched from the liquid passage 31t opens to the small diameter cylindrical surface portion 31e with the check valve 26 interposed, and accommodates a spring 9 described later in an assembled state with the first piston body 30. The safety valve pressurizing chamber 21, which is a space, communicates with the liquid passage 30h. The check valve 26 allows the flow from the small diameter cylinder portion 31n or the valve chamber 31s. An orifice 26a is provided in parallel with the check valve 26 to allow the flow toward the small-diameter cylinder portion 31n and the valve chamber 31s blocked by the check valve 26 slowly. Thus, the valve chamber 31s and the small diameter cylinder portion 31n
Also, the same hydraulic oil as that in the safety valve pressurizing chamber 21 is supplied.

Further, in the valve chamber 31s, there is housed a valve body 16a which is always biased rearward by a spring 44 and which normally sits on the valve seat 31u and shuts off the liquid passage 31v.
The liquid passage 31w communicating with the liquid passage 31v and the liquid passage 31x opening at the rear end of the valve chamber 31s are connected to the hydraulic oil tank 18 as shown in FIG. This valve body 16
As shown in FIG. 4, the front surface of a forms a boost pressure receiving surface 15, and the opening of the valve seat 31u forms a fuel chamber pressure receiving surface 17. The check valve 1 that allows the hydraulic oil in the hydraulic oil tank 18 to flow toward the liquid passage 31v is provided in the liquid passage 31w.
9 are intervening. The valve body 16 seated on this valve seat 31u
The open valve 16 provided with a has a fuel chamber pressure P ₂ at the time of normal combustion.
Therefore, the dimensions of the boost pressure receiving surface 15 and the fuel chamber pressure receiving surface 17 and the elastic force of the spring 44 are set so that the safety valve pressurizing chamber 21 is kept closed. As shown in FIG. 1, when the fuel chamber pressure P ₂ acts on the annular cross section 31z of the safety valve 4, a pressure P ₃ is pressed against the safety valve pressurizing chamber 21, and this pressure P ₃ acts on the fuel chamber pressure receiving surface 17. Try to open the open valve 16 by pushing it to the left.

Such a second piston body 31 is inserted into the first piston body 30, and the large diameter portion 30j of the first piston body 30 and the inner peripheral surface 31k of the annular space 31c are slidably engaged. The small diameter portion 30e and the small diameter cylindrical surface portion 31e are slidably engaged with each other, and the large diameter portion 30g and the medium diameter portion 31g are slidably engaged with each other. In this assembled state, the protrusion 4a enters the annular space 31c and the taper portion 30a and the outer peripheral surface 31j engage with each other to form the safety valve 4 having the seal portion 14. The airtightness of the seal portion 14 is prevented by the spring 9 which is the first urging means compressed and interposed in the safety valve pressurizing chamber 21 between the boost pressure receiving surface 30d and the boost pressure receiving surface 13.
The piston body 30 is constantly urged forward so that it is held at a predetermined pressure. Also, the first piston body 30 is
When the spring 9 is moved backward while being compressed, the rear end surface is locked to the annular step surface 31h of the second piston body 31, and the backward movement is restricted.

In such a fuel injection piston 3, the cylindrical surface portion 30c of the first piston body 30 is accommodated in the guide hole 2d of the injection mechanism main body 2 so as to be slidable in the direction of the central axis, and sealed by the seal ring 48. Is held. Thus, the combustion chamber 1 can be defined on the front side of the safety valve head portion 5 of the fuel injection piston 3, and the fuel chamber 8 can be defined on the rear side thereof. The fuel injection piston 3 has a pressure receiving area (spherical surface portion 31a) that defines the combustion chamber 1 and a pressure receiving area (annular cross section 31z, annular inclined step surface 30b) that defines the fuel chamber 8, and thus the combustion chamber 1
When the relatively low pressure P ₁ acts on the fuel injection piston 3, the fuel injection piston 3 retracts, and a fuel chamber pressure P ₂ higher than the pressure P ₁ is generated in the fuel chamber 8.

Next, the operation of the above embodiment will be described. Initially, the fuel chamber 8 is filled with the liquid fuel through the fuel injection passage 52 as shown in FIG.
4 is in close contact, the on-off valves 51 and 46 are both closed, and the projectile 7 is loaded in the gun cavity 20a before firing. If the igniter 50 is operated from this state, the initial combustion energy (initial combustion gas) flows into the combustion chamber 1. Along with this, the first piston body 30 and the second piston body 3
Since the fuel injection piston 3 made of 1 moves backward against the urging force of the second urging means 25, the fuel injection gap 6 opens.

On the other hand, since the pressure in the fuel chamber 8 is increased by the retreat of the fuel injection piston 3, a predetermined amount of liquid fuel in the fuel chamber 8 is injected into the combustion chamber 1 through the fuel injection gap 6, and the combustion chamber 1
It detonates inside and causes the projectile 7 to fly from the barrel 20. The fuel injection piston 3 at the time of detonation in the combustion chamber 1 gradually retreats to the right and continues to inject a predetermined amount of liquid fuel in the fuel chamber 8. That is, since there is an area difference between the spherical surface portion 31a that divides the combustion chamber 1 and the fuel chamber 8 and the annular cross section 31z and the annular inclined step surface 30b, during normal combustion, the combustion chamber 1
Of the pressure P ₁ on the fuel injection piston 3 causes the fuel chamber pressure P higher than the pressure P ₁ in the fuel chamber 8.
₂ is generated, and the liquid fuel in the fuel chamber 8 is injected into the combustion chamber 1 through the fuel injection gap 6. This fuel chamber pressure P ₂ is the pressure P ₁ of the combustion chamber 1, the area of the fuel injection gap 6, both pressures P ₁ ,
It is obtained in relation to the area difference on which P ₂ acts and is considerably higher than the pressure P ₁ in the combustion chamber 1.

At the time of such normal combustion, the safety valve 4
Are held so as not to open at the normal fuel chamber pressure P ₂ . The holding force of the safety valve 4 is given by the action of the spring 9 and the boosting piston 10 so that the safety valve 4 can withstand the normal high pressure P ₂ of the fuel chamber of the projectile launching apparatus. That is, the large-diameter piston portion when 10a is pressurized, booster booster pressure generating surface 10c of the rear surface is formed of the small-diameter piston portion 10b of the piston 10 of the by connexion booster piston 10 to the pressure P ₁ in the combustion chamber 1 side On the side, high pressure oil corresponding to both area ratios given by the difference in diameters B and C is generated, and this pressure oil flows into the safety valve pressurizing chamber 21 through the check valve 26,
Since the first piston body 30 and the second piston body 31 are separated from each other, the elastic force of the spring 9 is added to the safety valve 4.
It becomes the sealing power of.

The high-pressure liquid generated on the boosted pressure generating surface 10c simultaneously acts on the boosted pressure receiving surface 15 formed by the front surface of the valve body 16a and flows into the safety valve pressurizing chamber 21. Thus, when the fuel chamber pressure P ₂ during normal combustion acts on the safety valve head combustion chamber side pressure receiving surface A ₃ , a pressing pressure P ₃ related to the combustion chamber side pressure P ₁ is generated in the safety valve pressurizing chamber 21. ,
This pressure P ₃ acts on the fuel chamber pressure receiving surface 17 to push the release valve 16 to the left to open it. However, since the opening valve 16 has dimensions of the boost pressure receiving surface 15 and the fuel chamber pressure receiving surface 17 so as not to be opened by the fuel chamber pressure P ₂ during normal combustion, the pressing pressure P ₃ is generated. The safety valve pressurizing chamber 21 is kept closed. Thus, the sealing portion 14 of the safety valve 4 is maintained in the hermetically closed state when the pressing pressure P ₃ is equal to or lower than the predetermined pressure.

However, the force relationship for sealing the seal portion 14 of the safety valve 4 during normal combustion is as follows. (P ₁ ) × A ₁ + (P ₃ ) × A ₂ > (P ₂ ) × A ₃ Here, as shown in FIG. 4, the spherical surface portion 31 a constitutes the combustion pressure receiving surface A _{1 and} has an annular cross section. 31z constitutes the safety valve head portion combustion chamber side pressure receiving surface A _3, and the boost pressure receiving surface 13
Alternatively, the boost pressure receiving surface 30d constitutes the pressure receiving surface A ₂ of the safety valve pressurizing chamber 21. Then, (P ₁ ) × A ₁ is the pressing force of the safety valve 4 by the pressure P ₁ on the combustion chamber side, (P ₃ ) ×
A ₂ is the pressing force of the safety valve 4 by the boost pressure receiving surfaces 13 and 30d related to the pressure P ₁ on the combustion chamber side (however, including the elastic force of the spring 9), (P ₂ ) × A ₃ is , The opening force of the safety valve 4 due to the fuel chamber pressure P ₂ . The pressure P ₁ on the combustion chamber side acting on the front surface of the protrusion 4a of the first piston body 30 via the discharge hole 22 related to the pressing force of the safety valve 4, and the annular inclined step related to the opening force of the safety valve 4. The fuel chamber pressure P ₂ acting on the surface 30b is omitted.

After the flying body 7 flies in this way,
The fuel injection piston 3 is returned to the original position before firing by the urging force of the second urging means 25. As a result, the fuel injection gap 6 is closed again, so that the liquid fuel is supplied to the fuel chamber 8 and the preparation for firing is completed.

Although the above description is for the case of normal combustion, the flame of the combustion chamber 1 enters the fuel chamber 8 through the fuel injection gap 6 to cause a flashback phenomenon, and the liquid fuel in the fuel chamber 8 burns. When the pressure inside the fuel chamber 8 rises abnormally, the safety valve 4 operates. Here, the flashback phenomenon causes an abnormal pressure distribution in the fuel injection gap 6 when the liquid fuel in the fuel chamber 8 is injected into the combustion chamber 1, and the fuel chamber pressure P ₂ is the pressure on the combustion chamber 1 side. It is partially lower than P ₁ and is caused by the flame in the combustion chamber 1 entering the fuel chamber 8 and explosively burning in the fuel chamber 8.

However, when the fuel chamber pressure P ₂ acting on the annular cross section 31z due to flashback exceeds the holding pressure for closing the safety valve 4, the safety valve 4 operates and the fuel chamber pressure P ₂ is kept at the combustion chamber 1 Release to the side. That is, when the fuel chamber pressure P ₂ rises abnormally due to flashback, the force relationship is reversed and the opening valve 16 is opened while compressing the spring 44. Of course, the annular inclined step surface 30b of the first piston body 30 and the annular cross-section 31 of the second piston body 31 are arranged so that this reversal occurs.
The area ratio of z is set. As a result, as shown in FIG. 4, the second piston body 31 is
Moves forward, the pressure in the safety valve pressurizing chamber 21 rises, the open valve 16 having a predetermined set pressure is moved forward slightly to the left while compressing the spring 44, and is opened, and the fluid in the same chamber 21 passes through the liquid passage. It flows into the hydraulic oil tank 18 through 31v, the valve seat 31u, and the liquid passage 31x. The set pressure of the release valve 16 is set by the elastic force of the spring 44 and the pressure acting on the boost pressure receiving surface 15.

The opening pressure of the safety valve 4 thus obtained is related to the pressure P ₁ on the combustion chamber side. The open pressure of the safety valve 4 is determined by the pressure P ₂ in the fuel chamber 8 and the set pressure of the open valve 16, and the set pressure of the open valve 16 fluctuates according to the pressure P ₁ on the combustion chamber side. For example, the pressure P on the combustion chamber side
_The set pressure increases in a state where the pressure generated by the booster piston 10 operating at ₁ strongly acts on the booster pressure receiving surface 15. However, in that state, if the pressure in the safety valve pressurizing chamber 21 rises above the set pressure due to the forward movement of the second piston body 31 with respect to the first piston body 30, the open valve 16 is opened.

Thus, the pressure P ₂ in the fuel chamber 8 is generated according to the pressure P ₁ on the combustion chamber side as described above,
The pressure P ₁ on the combustion chamber side and the pressing pressure P ₃ in the safety valve pressurizing chamber 21 are a function of the pressure P ₁ on the combustion chamber side and the pressure P ₂ in the fuel chamber 8. Safety valve 4
The opening pressure of is related to the pressure P ₁ on the combustion chamber side.

If the safety valve 4 is opened in this way,
The pressure P ₂ in the fuel chamber 8 is released from the seal portion 14 to the combustion chamber 1 through the discharge hole 22. As a result, the pressure in the fuel chamber 8 is surely released to the combustion chamber 1 and then to the barrel 20, the abnormal increase in the pressure in the fuel chamber 8 is prevented, and the safety at the time of flashback is secured. . The pressure in the fuel chamber 8 is released to the combustion chamber 1 and then to the barrel 20, so that the projectile 7 in the barrel cavity 20a flies.

After the flying body 7 flies, the safety valve pressurizing chamber 21 is restored to its original volume when the safety valve 4 is closed and returned to its original state by the spring 9 which produces an initial pressing force. The pressure in 18 becomes higher than the pressure in the safety valve pressurizing chamber 21, the check valve 19 is activated, and the fluid in the hydraulic oil tank 18 is refilled in the safety valve pressurizing chamber 21. At the same time, the fluid in the safety valve pressurizing chamber 21 slowly flows into the liquid passage 31t through the orifice 26a, so that the boosting piston 10 is pushed by the spring 43 and returns to the forward position where it abuts against the stopper portion 31r. .

By the way, the opening operation of the safety valve 4 can be obtained even during normal combustion. During normal combustion,
When the pressure P ₁ on the combustion chamber side exceeds a predetermined pressure, the safety valve 4 is opened and the discharge hole 22 is opened to widen the fuel injection area, so that the fuel in the fuel chamber 8 also burns from this portion. It is injected into the chamber 1 and combustion energy increases.
Therefore, in order to positively open the safety valve 4 even during normal combustion, each part (the boost pressure receiving surface 15, the elastic force of the spring 9, the fuel chamber pressure receiving surface 17, the spring 44, and the large-diameter piston portion 10a are The diameter B, the diameter C of the small diameter piston portion 10b, the boost pressure receiving surfaces 13, 30d, etc.) are set,
By arbitrarily setting the operating pressure of the safety valve 4, the discharge hole 22 can be made to function similarly to the fuel injection gap 6. In that case, the safety valve 4 has a function as a fuel control mechanism for controlling combustion in addition to the safety function.

Further, the closing return operation of the safety valve 4 may occur during the fuel injection stroke. That is, when the excessive flashback pressure release in the fuel chamber 8 is completed in the middle of the fuel injection stroke, the safety valve 4 causes the pressure P ₁ on the combustion chamber side to act on the combustion pressure receiving surface A ₁ to cause the second piston body to move. 31 is the second urging means 25
In the state of countering the pressure, the pressure P ₃ derived in the safety valve pressurizing chamber 21 via the elastic force of the spring 9 and the boosting piston 10
As a result, the first piston body 30 and the second piston body 31 are integrated with each other, so that the safety valve 4 is closed to return to the initial state. Therefore, thereafter, the normal fuel injection state is restored. In addition to the hydraulic oil from the hydraulic oil tank 18, various fluids can be supplied to the small-diameter cylinder portion 31n, the valve chamber 31s, and the safety valve pressurizing chamber 21 to obtain the same operation.

[0034]

As can be understood from the above description,
According to the projectile launching device of the present invention, when the pressure in the fuel chamber is abnormally increased due to the flashback phenomenon, the safety valve is opened, and the fuel chamber and the combustion chamber communicate with each other through a large opening. As a result, it is possible to reliably prevent an abnormal rise in the pressure in the fuel chamber, prevent the destruction of the projectile launching device, especially the members that partition the fuel chamber during a flashback, and ensure safety. Become. In addition, since the pressure in the fuel chamber flows out into the combustion chamber when a flashback occurs, the projectile is fired, and continuous firing of the projectile is not hindered. Furthermore, it is possible to obtain the opening operation of the safety valve even during normal combustion,
As a result, both functions as a safety function and a fuel control function for controlling combustion can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view showing a projectile launching apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a first piston body.

FIG. 3 is a sectional view showing a second piston body of the same.

FIG. 4 is a similar operation explanatory diagram.

[Explanation of symbols]

1: Combustion chamber, 2: Injection mechanism body, 2a: Tapered part (inner wall), 4: Safety valve, 4a: Projection part, 5: Safety valve head part, 3: Fuel injection piston, 6: Fuel injection gap, 7: Flying body , 8: fuel chamber, 9: spring (first urging means),
10: Boost piston, 10a: Large diameter piston part, 10
b: small diameter piston part, 16: open valve, 20: barrel, 2
1: Safety valve pressurizing chamber, 22: Release hole, 25: Second biasing means, 30: First piston body, 31: Second piston body, 3
1b: opening portion, 31m: large diameter cylinder portion, 31n: small diameter cylinder portion, 31t: liquid passage, 31z: annular cross section (rear surface of front end portion), 50: igniter, A ₁ : combustion pressure receiving surface,
P _1: pressure in the combustion chamber side, P _2: the fuel chamber pressure, P _3: pressing pressure.

Claims (4)

[Claims] 1. An injection mechanism main body (2) connected to a rear end of a barrel (20), and an inner surface (2a) of the injection mechanism main body (2).
A fuel injection piston (3) slidable in the direction of the central axis along with the combustion chamber (1) connected to the barrel (20), and a pressure receiving area difference between front and rear surfaces of the fuel injection piston (3). The fuel injection gap (6) at the tip of the fuel injection piston (3) is opened by the backward movement due to the pressure acting on the liquid fuel in the fuel chamber (8) behind the fuel injection gap (6). Is injected into the combustion chamber (1), the injected liquid fuel is burned to generate a predetermined combustion gas pressure, and the barrel (2
A projectile launching device for launching a projectile (7) loaded in (0), wherein a fuel injection piston (3) is slidably fitted to the injection mechanism body (2) ( Three
0) and the first piston body (30) are slidably inserted in the direction of the central axis, and in the forward state, the outer surface of the safety valve head portion (5) at the front end portion is the inner wall of the injection mechanism body (2). (2a)
The fuel injection gap (6) can be closed by closely adhering to the combustion chamber (1) and is formed in the safety valve head portion (5).
And a second piston body (31) having a discharge hole (22) communicating with the fuel chamber (8), and a second piston body (31) for urging the first piston body (30) forward with respect to the second piston body (31). 1 urging means (9) and the projection (4a) at the front end of the first piston body (30) are provided with a safety valve (4) for opening and closing the rear part of the discharge hole (22), and at least due to flashback Due to the generation of the high fuel chamber pressure (P ₂ ), the second piston body (31) is advanced with respect to the first piston body (30) against the biasing force of the first biasing means (9), and the safety valve To open (4), the rear surface (31) of the front end of the second piston body (31).
z) is set, a projectile launching device. 2. The first urging means (9) comprises a safety valve pressurizing chamber (21) which is partitioned by a first piston body (30) and a second piston body (31) and contains a fluid, The projectile launching apparatus according to claim 1, wherein the safety valve pressurizing chamber (21) is maintained at a predetermined pressure by an opening valve (16) which opens at a set pressure. 3. A large-diameter piston part (10a) and a small-diameter piston part (10b) are provided in a deformed cylinder part having a large-diameter cylinder part (31m) and a small-diameter cylinder part (31n) in a second piston body (31). A booster piston (10) having a and is slidably provided, and the front portion of the large diameter cylinder portion is provided with an opening portion (31).
b) to communicate with the combustion chamber (1) and to act on the open valve (16) in the liquid passage (31t) at the rear part of the small diameter cylinder part (31n) to set the set pressure to the open valve (16). The projectile launching device according to claim 1 or 2, wherein 4. The safety valve pressurizing chamber (2) so that the pressure liquid in the liquid passage (31t) applies the biasing force of the first biasing means (9).
4. The projectile launching device according to claim 3, which acts on 1).