JP2012041944A - Fuel container mounting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel container mounting structure exerting a self-cleaning effect of removing dust adhering to a connection part on a machine body side.SOLUTION: In this fuel container mounting structure for mounting a fuel container 10 filled with fuel to a mounting object, the fuel container 10 includes an ejection nozzle 14 for ejecting the fuel by being inserted and connected in/to a connection part 20 of the mounting object; the connection part 20 includes a fuel passage 21 allowing the ejection nozzle 14 to be inserted therein and also includes a nozzle piston 23 slidable in the inside of the fuel passage 21 by being pushed in the ejection nozzle 14; and the nozzle piston 23 is energized in the opening direction of the fuel passage 21 to close the fuel passage 21 to generate a space S between the fuel passage 21 and itself.

Description

  The present invention relates to a fuel container mounting structure for mounting a fuel container filled with fuel to a mounted body.

  2. Description of the Related Art Conventionally, for example, a driving tool such as a gas combustion type nailing machine that explosively burns fuel gas supplied from a fuel container and drives a striking mechanism is known. In order to connect the fuel container to such a driving tool, for example, a connecting portion for connecting the fuel container to the driving tool is provided, and the nozzle of the fuel container is inserted into the connecting portion to be connected. . Then, by forming a passage from the connecting portion to the fuel metering device, the fuel supplied from the fuel container is supplied to the combustion chamber of the machine via the fuel metering device.

  By the way, in such a fuel container connection structure, in a state where the fuel container is not connected, the passage leading to the fuel metering device is opened, so that dust or dust easily enters these parts, and the fuel metering device And a defect was supposed to occur in the seal part.

  In order to solve such a problem, Patent Document 1 discloses that an inner peripheral surface of an opening end portion of a connection sleeve provided in a connection portion on the machine body side is in contact with a nozzle piston whose end portion is closed in a standby state. Further, there is disclosed an invention provided with a seal member for preventing dust from entering from the end portion.

JP 2009-275874 A

  However, since the invention described in Patent Document 1 does not actively remove dust adhering to the connection portion on the machine body side, there is a problem that once dust adheres, the dust remains attached. there were. In particular, since the connecting portion into which the nozzle of the fuel container is inserted is a portion that comes into contact with the outside, there is a problem that dust tends to accumulate.

  Then, this invention makes it a subject to provide the fuel container attachment structure which exhibits the self-cleaning effect which removes the dust adhering to the connection part by the side of a machine main body.

  The present invention has been made to solve the above-described problems, and is characterized by the following.

(Claim 1)
The invention described in claim 1 is characterized by the following points.

  That is, the fuel container mounting structure according to claim 1 is a fuel container mounting structure for mounting a fuel container filled with fuel to a mounted body, and the fuel container is inserted into a connection portion of the mounted body. A jet nozzle connected to inject fuel; and the connecting portion includes a fuel flow path into which the jet nozzle can be inserted, and can be slid into the fuel flow path by being pushed into the jet nozzle. A nozzle piston is provided, and the nozzle piston is biased in the opening direction of the fuel flow path, and closes the fuel flow path so that a gap is generated between the nozzle piston and the fuel flow path.

(Claim 2)
The invention described in claim 2 has the following features in addition to the features of the invention described in claim 1 described above.

  That is, a reduced diameter portion is formed in the vicinity of the opening on the inner periphery of the fuel flow path, and a plurality of protrusions are provided on the outer periphery of the nozzle piston in the circumferential direction. When biased in the opening direction of the road, the plurality of protrusions are locked to the reduced diameter portion to block the fuel flow path.

(Claim 3)
The invention described in claim 3 is characterized by the following points in addition to the characteristics of the invention described in claim 2 described above.

  That is, a ring-shaped seal member for sealing the periphery of the ejection nozzle when the ejection nozzle is attached is provided on the inner periphery of the fuel flow path, and the reduced diameter portion is formed by this seal member. It is characterized by that.

(Claim 4)
The invention according to claim 4 is characterized by the following points in addition to the features of the invention according to any one of claims 1 to 3.

  That is, the tip of the ejection nozzle is formed with a taper that gradually decreases in diameter toward the tip.

  The invention according to claim 1 is as described above, and the connecting portion of the mounted body such as a driving tool includes a fuel flow path into which the ejection nozzle can be inserted, and is pushed into the ejection nozzle to be connected to the fuel flow path. A nozzle piston that is slidable inside, and the nozzle piston is biased in the opening direction of the fuel flow path so as to close the fuel flow path so that a gap is generated between the nozzle piston and the fuel flow path. Is formed. For this reason, the nozzle piston is urged so as to block the fuel flow path, so that dust does not enter the fuel flow path when the fuel container is not connected. Further, when the fuel container is removed after being connected, the pressure in the fuel flow path is increased by supplying the fuel gas from the fuel container, so that the fuel gas is discharged from the gap between the nozzle piston and the fuel flow path. Is discharged. Thereby, not only the residual gas is efficiently discharged, but also a self-cleaning effect of removing dust adhering to the vicinity of the opening of the fuel flow path by the air pressure at the time of discharge can be exhibited.

  Further, the invention according to claim 2 is as described above, and a reduced diameter portion is formed in the vicinity of the opening on the inner periphery of the fuel flow path, and the outer periphery of the nozzle piston is provided in the circumferential direction. A plurality of protrusions are provided, and when the nozzle piston is urged in the opening direction of the fuel flow path, the plurality of protrusions are locked to the reduced diameter portion to close the fuel flow path. ing. For this reason, the self-cleaning effect as described above can be exhibited with a simple structure.

  Further, the invention according to claim 3 is as described above, and a ring-shaped sealing member for sealing the periphery of the ejection nozzle when the ejection nozzle is attached to the inner periphery of the fuel flow path. Therefore, it is possible to prevent dust from entering the fuel flow path when the fuel container is connected. And since the said diameter reduction part was formed with this sealing member, it is not necessary to provide the diameter reduction part which latches a nozzle piston separately, and it can be set as a simple structure. Further, since the number of seal members can be small, the sliding resistance received by the ejection nozzle of the fuel container can be reduced, and the ejection nozzle before being completely connected is pushed in by the sliding resistance, causing gas leakage. Can be prevented.

  Further, the invention according to claim 4 is as described above, and the tip portion of the ejection nozzle is formed with a tapered portion that gradually decreases in diameter toward the tip side. And gas leakage from the ejection nozzle can be prevented.

It is explanatory drawing which shows a mode that a fuel container is attached to a to-be-attached body. It is the elements on larger scale of the ejection nozzle of a fuel container. It is the elements on larger scale of the connection part when a fuel container is removed. It is the figure which looked at the opening of the connection sleeve from the front.

  Embodiments of the present invention will be described with reference to the drawings.

  The fuel container mounting structure according to this embodiment is for detachably mounting the fuel container 10 filled with fuel to a gas combustion type driving tool (attachment body), and specifically, provided in the driving tool. By connecting the connecting sleeve 20 (connecting portion) and the ejection nozzle 14 provided in the fuel container 10, the fuel container 10 can be attached to and detached from the gas combustion type driving tool.

  Here, as shown in FIG. 1, the fuel container 10 includes a container main body 11 made of an aluminum cylindrical member. A jet nozzle 14 that is inserted into and connected to a connection sleeve 20 of a gas combustion type driving tool is integrally formed at the distal end of the container body 11. The ejection nozzle 14 is for injecting liquefied fuel gas into the fuel flow path 21 in the connection sleeve 20 when inserted into the connection sleeve 20.

  The injection of the liquefied fuel gas is realized by the following configuration. That is, an inner bag (not shown) filled with liquefied fuel gas is provided inside the container body 11, and the space between the inner bag and the container body 11 is caused by the pressure of the liquefied fuel gas. Is also filled with high-pressure compressed gas. For this reason, the compressed gas presses the surface of the inner bag, and the liquefied fuel gas filled in the inner bag is jetted to the outside from the jet nozzle 14. The fuel container 10 supplies fuel gas to the striking mechanism of the gas combustion type driving tool by this injection.

  Although not particularly illustrated, an opening / closing mechanism that opens and closes the flow path between the ejection nozzle 14 and the inner bag is provided inside the fuel container 10, and this opening / closing mechanism includes the fuel container 10, the connection sleeve 20, and the like. When is connected, the flow path between the ejection nozzle 14 and the inner bag is opened, and fuel gas is injected from the ejection nozzle 14. That is, the opening / closing mechanism closes the flow path between the ejection nozzle 14 and the inner bag in a normal state (when not connected), but the fuel container 10 is inserted and connected to the connection sleeve 20 so that the ejection nozzle 14 When the tip is pressed in the depth direction of the fuel container 10, the flow path between the ejection nozzle 14 and the inner bag is opened, and the fuel gas filled in the inner bag is injected from the ejection nozzle 14. ing.

  Further, as shown in FIG. 2, a tapered portion 14a that gradually decreases in diameter toward the distal end side is formed at the distal end portion of the ejection nozzle 14. The taper portion 14a is for reducing the sliding resistance that the ejection nozzle 14 receives when the ejection nozzle 14 is attached to the connection sleeve 20. The taper portion 14a is provided with the sliding resistance. The tip of the jet nozzle 14 is less likely to be pressed in the back direction, and the problem is that the gas jet leaks due to the jet nozzle 14 being pressed during connection.

  As shown in FIG. 1, an adapter sleeve 12 is attached to the distal end portion of the container body 11 from which the ejection nozzle 14 is formed so as to protrude, and an inner plate 13 is further slidable at the distal end of the adapter sleeve 12. Is provided.

  The adapter sleeve 12 has a cylindrical shape made of synthetic resin, and is fitted and attached to the tip of the container body 11. The tip of the ejection nozzle 14 is provided so as to protrude outward from the opening end of the adapter sleeve 12.

  The inner plate 13 is slidably fitted inside the adapter sleeve 12, and a nozzle hole 13b for the ejection nozzle 14 is formed at the center. Further, around the nozzle hole 13b, an annular projection guide portion 13a for guiding the connection sleeve 20 is provided. When the inner plate 13 is in a standby state, the inner plate 13 is biased outward by a biasing spring (not shown) provided inside the container body 11 and is engaged with the outer peripheral end of the adapter sleeve 12. Yes.

  On the other hand, as shown in FIG. 1, the connecting sleeve 20 constituting the connecting portion for attaching the fuel container 10 includes a fuel flow path 21 into which the ejection nozzle 14 can be inserted. When the ejection nozzle 14 is inserted and connected to the fuel flow path 21, fuel gas is supplied from the ejection nozzle 14, and the supplied fuel gas is guided to the striking mechanism through the fuel flow path 21.

  As shown in FIG. 1, a nozzle piston 23 that is pushed into the ejection nozzle 14 and is slidable in the fuel flow path 21 is provided near the opening of the fuel flow path 21. As shown in FIG. 1A, the nozzle piston 23 is urged toward the opening of the fuel flow path 21 by a spring 24 in a standby state, and closes the opening of the fuel flow path 21.

  A plurality of projections 23 a are provided on the outer periphery of the nozzle piston 23 in the circumferential direction. The plurality of protrusions 23 a are engaged with the seal member 22 to close the fuel flow path 21 when the nozzle piston 23 is biased in the opening direction of the fuel flow path 21 by the spring 24, and the nozzle piston 23 is This is to prevent the fuel flow path 21 from jumping out from the opening.

  When the fuel container 10 is attached to the connection sleeve 20 from this state, it is attached so that the end of the connection sleeve 20 is pressed against the exposed surface of the inner plate 13 of the fuel container 10 as shown in FIG. At this time, since the tip of the connection sleeve 20 is formed so as to be fitted inside the guide portion 13a of the inner plate 13, it is easy to position.

  When the fuel container 10 is further pressed in the direction of the connection sleeve 20 from the state of FIG. 1B, the fuel container 10 can be attached to the connection sleeve 20 as shown in FIG.

  As shown in FIG. 1C, when the fuel container 10 is attached to the connection sleeve 20, the inner plate 13 in contact with the connection sleeve 20 slides inward so as to be buried in the adapter sleeve 12. As the nozzle 13 slides, the ejection nozzle 14 protrudes from the nozzle hole 13 b of the inner plate 13. The protruding jet nozzle 14 is inserted and connected to the fuel flow path 21 and pushes the nozzle piston 23 in the fuel flow path 21 into the back of the fuel flow path 21. At this time, when the tip of the ejection nozzle 14 comes into contact with the nozzle piston 23 and pressure is applied, the aforementioned opening / closing mechanism opens the flow path between the ejection nozzle 14 and the inner bag, and the fuel gas filled in the inner bag Is ejected from an ejection hole (not shown) provided at the tip of the ejection nozzle 14. Thus, the fuel gas injected from the ejection nozzle 14 is supplied to the striking mechanism of the driving tool through the fuel flow path 21.

  As shown in FIG. 1, a ring-shaped seal member 22 for sealing the periphery of the ejection nozzle 14 when the ejection nozzle 14 is attached is provided on the inner periphery of the fuel flow path 21. Therefore, the outer periphery of the ejection nozzle 14 is sealed so that the gas fuel ejected from the ejection hole provided at the tip of the ejection nozzle 14 does not leak out of the fuel flow path 21.

  When the fuel container 10 attached in this way is removed, the fuel container 10 is pulled away from the connection sleeve 20 as shown in FIG. Then, the ejection nozzle 14 comes out of the fuel flow path 21 and the connection between the fuel container 10 and the connection sleeve 20 is released. At this time, the nozzle piston 23 is urged in the opening direction of the fuel flow path 21 by the spring 24 so as to close the opening of the fuel flow path 21. The urged nozzle piston 23 is locked by a seal member 22 fitted in the inner periphery of the fuel flow path 21 in the vicinity of the opening of the fuel flow path 21. That is, as shown in FIG. 3 and FIG. 4, the provision of the seal member 22 reduces the inner diameter of the fuel flow path 21 at the seal portion, and this reduced diameter portion (that is, the seal member 22). ) Engages with the plurality of protrusions 23 a of the nozzle piston 23 to close the fuel flow path 21. Thus, by closing the fuel flow path 21 with the nozzle piston 23, dust does not enter the fuel flow path 21 in a state where the fuel container 10 is not connected.

  Thus, although the nozzle piston 23 closes the fuel flow path 21 by being urged in the opening direction of the fuel flow path 21, the fuel flow path 21 and the outside are not completely cut off. That is, as shown in FIG. 4, since the outer diameter of the shaft portion 23 b of the nozzle piston 23 is smaller than the inner diameter of the seal member 22, a portion where the plurality of protrusions 23 a and the seal member 22 are engaged. A gap S is formed between the shaft portion 23 b of the nozzle piston 23 and the seal member 22.

  For this reason, as shown in FIG. 3, when the connected fuel container 10 is removed, the pressure in the fuel flow path 21 is increased because the fuel container 10 supplies the fuel gas. The fuel gas in the fuel flow path 21 is discharged from the gap S with the fuel flow path 21. Thereby, not only the residual gas in the fuel flow path 21 can be efficiently discharged, but also a self-cleaning effect of removing dust adhering to the vicinity of the opening of the fuel flow path 21 by the air pressure at the time of discharge can be exhibited.

  As described above, according to the present embodiment, the dust adhering to the connection portion (connection sleeve 20) where dust is particularly likely to collect can be automatically removed by attaching and detaching the fuel container 10.

  Further, since the sealing member 22 for sealing the periphery of the ejection nozzle 14 when the fuel gas is supplied is provided, dust can be prevented from entering the fuel flow path 21 when the fuel container 10 is connected. In addition, when the fuel container 10 is removed, the seal member 22 is engaged with the nozzle piston 23, so that it is not necessary to provide a reduced diameter portion for engaging the nozzle piston 23. A self-cleaning effect as described above can be exhibited with a simple structure.

  Further, according to the present embodiment, since the number of the seal members 22 can be reduced, the sliding resistance received by the ejection nozzle 14 of the fuel container 10 can be reduced, and the ejection nozzle 14 before being completely connected slides. It is possible to prevent gas leakage due to being pushed in by resistance.

  In the above-described embodiment, the plurality of protrusions 23a are provided on the outer periphery of the nozzle piston 23, but the present invention is not limited to this. That is, the nozzle piston 23 only needs to be able to close the fuel flow path 21 so that a gap is generated between the nozzle piston 23 and the fuel flow path 21 when urged in the opening direction of the fuel flow path 21. . For example, a protrusion is provided in the fuel flow path 21 or a notch is provided in the nozzle piston 23 or the fuel flow path 21 so that the nozzle piston 23 biased by the spring 24 is locked in the fuel flow path 21. It may be.

DESCRIPTION OF SYMBOLS 10 Fuel container 11 Container main body 12 Adapter sleeve 13 Inner plate 13a Guide part 13b Nozzle hole 14 Injection nozzle 14a Taper part 20 Connection sleeve (connection part)
21 Fuel flow path 22 Seal member 23 Nozzle piston 23a Protrusion 23b Shaft 24 Spring S Gap

Claims (4)

A fuel container mounting structure for mounting a fuel container filled with fuel to a mounted body,
The fuel container includes an ejection nozzle that is inserted and connected to a connection portion of the attached body to inject fuel.
The connection portion includes a fuel flow path into which the ejection nozzle can be inserted, and a nozzle piston that is pushed into the ejection nozzle and can slide in the fuel flow path.
The fuel container mounting structure, wherein the nozzle piston is urged in an opening direction of the fuel flow path to close the fuel flow path so that a gap is generated between the nozzle piston and the nozzle piston. On the inner periphery of the fuel flow path, a reduced diameter portion is formed near the opening,
On the outer periphery of the nozzle piston, a plurality of protrusions are provided in the circumferential direction,
2. The fuel flow path according to claim 1, wherein when the nozzle piston is urged in an opening direction of the fuel flow path, the plurality of protrusions are locked to the reduced diameter portion to block the fuel flow path. Fuel container mounting structure.   A ring-shaped seal member for sealing the periphery of the ejection nozzle when the ejection nozzle is attached is provided on the inner periphery of the fuel flow path, and the reduced diameter portion is formed by this seal member. The fuel container mounting structure according to claim 2, wherein the fuel container mounting structure is characterized.   The fuel container mounting structure according to any one of claims 1 to 3, wherein a taper portion that gradually decreases in diameter toward the tip side is formed at a tip portion of the ejection nozzle.

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