JP6210843B2 - Injection gun for liquid injection device - Google Patents

Description

  The present invention relates to an injection gun for a liquid injection device used when, for example, a liquid such as oil or gasoline is injected into a container such as a plastic tank.

The injection gun of this type of liquid injection device inserts the nozzle at the tip of the gun into the container and injects the liquid. When a predetermined amount of liquid is injected into the container, the valve inside the valve body is closed. After the valve is used, it is used to extract the nozzle part from the container. However, when the nozzle part is extracted from the container after the liquid is injected, some liquid remains in the valve body and the nozzle part downstream from the valve. If this is the case, there is a problem that the residual liquid leaks out from the tip of the nozzle part and soils the floor or the like.
In particular, when the injection target is a highly viscous liquid such as oil, the liquid tends to adhere to the inside of the valve body or nozzle part, which leaks out and soils the floor, etc. There is a concern that the foot will fall (slide) due to the liquid leaking to the floor, etc. and fall.

  Therefore, in order to remove the liquid that adheres and remains inside the valve body and nozzle part after liquid injection, it is configured to blow air into the nozzle part and blow off the remaining liquid into the storage container by air blow. Conventional injection guns have already been proposed.

  5 and 6 show the configuration of a conventionally proposed injection gun G that employs an air blow system. The injection gun G has an internal channel 1 that is vertically oriented, a valve body 3 having a liquid injection port 2 formed at the upper end of the internal channel 1, and a lower end of the internal channel 1 in the valve body 3. The nozzle part 4 connected to the part, and the valve seat 5 formed in a posture orthogonal to the liquid flow direction in the upper and lower intermediate parts of the internal flow path 1 in the valve body 3 so as to contact and separate from each other. It has a stopper valve 6 that can reciprocate horizontally or substantially horizontally, and a piston body 7 that is directly connected to the stopper valve 6. The piston body 7 and the stopper valve 6 can be moved horizontally or substantially horizontally by switching the air blowing position. The double-acting air cylinder 8 that is driven to move in the forward and reverse directions along the nozzle part 4 and the side face part of the nozzle body 4 near the internal flow path 1 in the valve body 3 toward the central passage 4a of the nozzle part 4 Air blowing that can blow in air An air blowing pipe 9 having a write port 9a, and a. As shown in FIGS. 5 and 6, the nozzle portion 4 is configured by sequentially connecting a plurality of joint members 4 b.

  In the conventionally proposed injection gun G adopting the air blow system configured as described above, the position of the air blowing port 9a for air blowing makes the stopper valve 6 abut against the valve seat 5 to prevent liquid flow. As shown in FIG. 5, the stopper valve 6 is separated from the valve seat 5 via the air cylinder 8 and the central passage 4 a of the nozzle portion 4 from the internal flow path 1 of the valve body 3, as shown in FIG. 5. Even in a normal liquid injection state that allows liquid flow into the nozzle portion 4, a part of the liquid La remains in the vicinity of the air blowing port 9 a in the nozzle portion 4.

  Further, as shown in FIG. 6, in a state where the stopper valve 6 a is brought into contact with the valve seat 5 and the flow of the liquid is blocked, a part of the liquid La flows in the internal flow path 1 in the valve body 3 downstream of the stopper valve 6. In order to adhere and remain on the wall surface, when air is blown from the air blowing port 9a toward the central passage 4a of the nozzle portion 4, a part La of the liquid remaining in the vicinity of the air blowing port 9a is Even if it can be removed, it is necessary to lengthen the air blow time in order to blow off a part of the liquid La remaining on the wall surface of the internal flow path 1 in the valve body 3, and therefore, for a predetermined liquid injection operation. There was a problem of being very troublesome.

  In addition, since the nozzle portion 4 has a joint structure with a plurality of joint members 4b, a part of the liquid Lb is accumulated in each joint part, and a part of the liquid Lb accumulated in each joint part is When the nozzle part 4 is extracted from the storage container after the liquid is injected, there is a problem that it is unavoidable that the nozzle part 4 leaks from the tip of the nozzle part 4.

  The present invention has been made in view of the above circumstances, and by blowing air after liquid injection, the liquid remaining on the inside of the valve main body and the nozzle portion can be reliably and quickly even with a short air blow time. An object of the present invention is to provide an injection gun for a liquid injection device that can be discharged.

An injection gun of a liquid injection device according to the present invention devised to achieve the above object has a valve main body having an internal channel which is directed vertically and having a liquid injection port formed in a side surface portion of the internal channel A nozzle part connected to the lower part of the internal flow path of the valve body so as to form a horizontal or substantially horizontal valve seat at a position lower than the liquid inlet, and an upper part of the valve seat to the valve body. It is supported so as to be able to move up and down, and abuts against the valve seat when descending to prevent liquid flow from the internal flow path to the nozzle portion, and when lifted, it is spaced apart from the valve seat upward and away from the internal flow path. A stopper valve that allows liquid flow to the nozzle portion, a valve lift drive device that drives the stopper valve to move up and down, and a liquid flow from the internal flow path to the nozzle portion when the stopper valve is in contact with the valve seat In a state where the nozzle is blocked A delivery gun for liquid injection device equipped with an air blowing passage of blowing air into,
The air blow passage has an upper and lower air passage formed in the vertical direction along the inside of the stopper valve, and an air blowing port to the air blow passage is provided on the valve main body above the liquid injection port. Formed on the side,
The air blown from the air blowing port is configured to be discharged from the valve seat to the nozzle portion below through the air blow passage ,
further,
The air blow passage has a horizontal air passage formed in communication in the left-right direction from the upper end portion of the upper and lower air passages toward the radially outer side of the stopper valve,
Moreover,
The inner peripheral portion of the valve body corresponding to the outer peripheral surface of the stopper valve has the horizontal portion of the air blow passage only in the closed state in which the stopper valve is moved down so as to contact the valve seat. An annular air passage communicating with the air passage is formed .

  According to the injection gun of the liquid injection device according to the present invention having the characteristic configuration as described above, in a state where the stopper valve is brought into contact with the valve seat to prevent the liquid flow from the internal flow path to the nozzle portion in the valve body, An air blowing air inlet for blowing air into the nozzle part is provided above the position of the liquid inlet to the internal flow path. Even if a part of the liquid remains attached, not only does the residual liquid leak from the tip of the gun through the nozzle part, but even if there is a liquid remaining attached to the inside of the nozzle part, The residual liquid can be discharged and collected from the tip of the gun into the liquid container in a short time by blow air blown into the nozzle portion through the air blow passage. Therefore, by blowing air after injecting the liquid, even if there is liquid remaining on the inside of the nozzle part, this residual liquid is surely and quickly discharged into the liquid container and collected in a short air blow time. As a result, it is possible to prevent the liquid from leaking to the floor or the like and to improve the efficiency of the predetermined liquid injection operation.

In particular, in the injection gun of the liquid injection apparatus according to the present invention, it is preferable that the nozzle portion is formed in an integral straight structure without a joint portion (Claim 2).
In this case, since the inside of the nozzle part has an uneven shape, it is difficult for the liquid to accumulate inside the nozzle part, and even if a minute amount of liquid adheres and remains on the inner wall surface, the nozzle passes through the air blow passage. The air can be reliably and smoothly discharged into the liquid container and collected by the blow air blown into the inside of the unit.

Moreover, in the injection gun of the liquid injection device according to the present invention, it is preferable that the lower end portion of the air blow passage formed vertically inside the stopper valve is divided into a plurality of air passages extending in the left-right direction ( Claim 3).
In this case, the blow air that has reached the lower end of the air blow passage is blown out from the plurality of air passages divided in the left-right direction toward the inner peripheral wall surface of the nozzle portion, so that the liquid is applied to the inner peripheral wall surface of the nozzle portion. Regardless of the distribution state of the part, the liquid can be reliably blown out by blow air and collected in the liquid storage container.

Further, in the injection gun of the liquid injection device according to the present invention, the valve lifting and lowering drive device moves the stopper valve upward in a direction away from the valve seat by supplying air into the valve body, and It is preferable that the stopper valve is moved downward in the direction in which the valve seat comes into contact with the valve seat by the force of a spring by extracting the air inside the valve body (Claim 4).
In this case, the valve opening and closing operations by raising and lowering the stopper valve can be speeded up, and the prevention of the liquid leakage at the time of valve closing can be ensured to further enhance the liquid leakage prevention function.

It is a partially broken front view which shows the liquid injection state in the injection | pouring gun of the liquid injection apparatus which concerns on this invention. It is an enlarged vertical front view of the principal part which shows the liquid injection | pouring state in an injection gun same as the above. It is a partially broken front view which shows the air blow state and standby state in an injection gun same as the above. It is an enlarged vertical front view of the principal part which shows the air blow state in an injection gun same as the above. It is a partially broken front view which shows the liquid injection state in the injection gun of the conventional liquid injection apparatus. It is a partially broken front view which shows the air blow state in the conventional injection gun same as the above.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a partially broken front view showing a state in which a liquid L such as oil is being injected into a storage container using an injection gun G of a liquid injection apparatus according to the present invention, and FIG. FIG. 3 is a partially cutaway front view showing a standby state of the injection gun G and an air blow state after liquid injection, and FIG. 4 is an enlarged vertical front view of a main part during the air blow. As shown in FIGS. 1 to 4, the injection gun G includes a cylindrical valve body 13, a nozzle portion 14, a stopper valve 16, a valve lifting / lowering drive device 17 that drives the stopper valve 16 to lift and lower, and the nozzle portion. And an air blow passage 18 through which air is blown.

  The valve body 13 has an internal channel 11 that is directed vertically, and a liquid injection port 12 is formed in a side surface portion of the internal flow channel 11. A liquid injection tube 20 is connected to the liquid injection port 12. Yes. A stopper valve 16 is pierced and supported at the center of the valve body 13 so as to be slidable up and down.

  The nozzle portion 14 has a funnel-like portion 14A connected to the lower inside of the internal flow path 11 of the valve body 13, and a straight structure without a joint portion formed integrally with the lower end of the funnel-like portion 14A. And a valve seat 15 having a horizontal or substantially horizontal posture is formed at a position lower than the liquid inlet 12 at the upper end of the funnel-shaped portion 14A.

  The valve raising / lowering driving device 17 is a piston body that is fitted in a cylinder 21 connected to the upper end portion of the valve body 13 so as to be movable up and down, and is integrally connected to the upper end portion of the stopper valve 16 via a screw member 23. 22 and a spring 24 interposed between the upper portion of the piston body 22 and the upper bottom portion of the cylinder 21, by supplying air A 1 into the cylinder 21 below the piston body 22. Then, the stopper valve 16 is moved upward in the direction away from the valve seat 15 through the piston body 22 to open the valve, and the air A1 is extracted from the inside of the cylinder 21, whereby the elastic restoring force of the spring 24 is recovered. Thus, the stopper valve 16 is moved downward in a direction to contact the valve seat 15 to be closed.

  The air blow passage 18 includes a vertical air passage 18a formed in the vertical direction along the inner center position of the stopper valve 16, and a radially outward direction of the stopper valve 16 from an upper end portion of the vertical air passage 18a. A horizontal air passage 18b formed in communication in the left-right direction and a horizontal air passage 18c formed in communication from the lower end portion of the upper and lower air passages 18a in the left-right direction. Further, the air blow passage 18 is provided only on the inner peripheral portion of the valve body 13 corresponding to the outer peripheral surface of the stopper valve 16 in the closed state in which the stopper valve 16 is moved down so as to contact the valve seat 15. Among them, an annular air passage 26 connected to the upper horizontal air passage 18b is formed.

  A blow air blowing port capable of blowing blow air into the air blow passage 18 via the annular air passage 26 on the peripheral side surface portion of the valve body 13 above the liquid injection port 12. The air A2 blown from the air blowing port 25 is discharged to the nozzle portion 14 below the valve seat 15 through the annular air passage 26 and the air blow passage 18. It is comprised so that.

Next, a description will be given of a liquid injection operation for injecting a liquid such as oil into a liquid container such as a polytank and an air blow operation immediately after the operation using the injection gun G of the liquid injection apparatus configured as described above. To do.
First, as shown in FIGS. 1 and 2, by supplying air A1 into the cylinder 21 below the piston body 22, the piston body 22 is raised against the elastic force of the spring 24, and the piston The stopper valve 16 is lifted and moved in a direction away from the valve seat 15 through the raising of the body 22 to open the valve.

  In this state, after the tip portion of the nozzle portion 14 is inserted into a liquid container such as a polytank and then a liquid L such as oil is supplied to the liquid injection tube 20, the supplied liquid L is indicated by an arrow in FIG. As shown, after flowing from the liquid inlet 12 through the internal flow path 11 of the valve body 13 to the funnel-shaped portion 14A of the nozzle portion 14 and the cylindrical portion 14B having a straight structure, the inside of the liquid storage container Injected into.

  When a predetermined amount of liquid is injected into the liquid container, the piston body 22 is lowered by the elastic restoring force of the spring 24 by extracting the air A1 from the inside of the cylinder 21, and FIG. As shown in FIG. 4, the stopper valve 16 is brought into contact with the valve seat 15 to close the valve, thereby preventing the flow of liquid from the internal flow path 11 to the nozzle portion 14. When the stopper valve 16 is in contact with the valve seat 15 as described above, as shown in FIG. 4, the upper end of the upper and lower air passages 18a formed along the inner center position of the stopper valve 16 is the upper portion. The annular air passage 26 formed in the inner peripheral portion of the valve main body 13 is connected to be communicated via the horizontal air passage 18b.

  In this state, when the blow air A2 is blown from the blow air blowing port 25 toward the annular air passage 26, the blown air blown into the upper and lower air passages 18a of the air blow passage 18 and a plurality of horizontal air passages 18c. After that, the nozzle 15 is discharged below the valve seat 15. Even if a part of the liquid adheres and remains inside the nozzle portion 14 at the time of liquid injection by the air blow immediately after such liquid injection, the remaining liquid passes through the air blow passage 18 to the inside of the nozzle portion 14. It is possible to discharge (collect) the liquid from the tip of the gun to the liquid container in a short time by the blow air blown out.

  In particular, since the nozzle portion 14 is formed in an integral straight structure without a joint portion, and the inside of the nozzle portion 14 has a shape without irregularities, it is difficult for liquid to accumulate in the nozzle portion 14, Even if a very small amount of liquid adheres to and remains, it can be surely and smoothly discharged (collected) into the liquid container by the blow air blown into the nozzle portion 14 through the air blow passage 18.

Further, the air blow passage 18 is formed vertically inside the stopper valve 16, and the downstream end of the air blow passage 18 is divided into a plurality of horizontal air passages 18c extending in the left-right direction. The blown air that has reached the downstream end of the passage 18 is blown into the funnel-shaped portion 14A of the nozzle portion 14 from the plurality of horizontal air passages 18c divided in the left-right direction. Regardless of the distribution state of the liquid on the peripheral wall surface, the liquid can be blown off by a short blow air and collected in a liquid container.

  In the injection gun G of the liquid injection device according to the present invention, as the valve lifting / lowering drive device 17, as shown in the above-described embodiment, a configuration using air and spring force is used as the response of the operation. However, the present invention is not limited to this. For example, the stopper valve 16 may be driven up and down using a double-acting cylinder.

DESCRIPTION OF SYMBOLS 11 Internal flow path 12 Liquid inlet 13 Valve body 14 Nozzle part 15 Valve seat 16 Stop valve 17 Valve raising / lowering drive device 18 Air blow passage 18c Several division | segmentation horizontal air passage 24 Spring G Injection gun

Claims (4)

A valve body having an internal channel that is vertically directed and having a liquid inlet formed in a side surface of the internal channel, and a valve seat having a horizontal or substantially horizontal posture is formed at a position lower than the liquid inlet. A nozzle part connected to the lower part of the internal flow path of the valve body, and is supported by the valve body so that it can be raised and lowered at the upper part of the valve seat, and comes into contact with the valve seat when descending from the internal flow path to the nozzle part A stopper valve that prevents a liquid flow to the nozzle and is spaced upward from the valve seat when it is raised to allow a liquid flow from the internal flow path to the nozzle portion, and a valve lift drive that drives the stopper valve to move up and down A liquid injection apparatus comprising: an apparatus; and an air blow passage for blowing air into the nozzle portion in a state where the stopper valve is in contact with the valve seat and prevents a liquid flow from the internal flow path to the nozzle portion With an injection gun Te,
The air blow passage has an upper and lower air passage formed in the vertical direction along the inside of the stopper valve, and an air blowing port to the air blow passage is provided on the valve main body above the liquid injection port. Formed on the side,
The air blown from the air blowing port is configured to be discharged from the valve seat to the nozzle portion below through the air blow passage ,
further,
The air blow passage has a horizontal air passage formed in communication in the left-right direction from the upper end portion of the upper and lower air passages toward the radially outer side of the stopper valve,
Moreover,
The inner peripheral portion of the valve body corresponding to the outer peripheral surface of the stopper valve has the horizontal portion of the air blow passage only in the closed state in which the stopper valve is moved down so as to contact the valve seat. An injection gun for a liquid injection device, characterized in that an annular air passage connected to the air passage is formed .   2. The injection gun for a liquid injection apparatus according to claim 1, wherein the nozzle portion is formed in an integral straight structure without a joint portion.   The injection gun of the liquid injection device according to claim 1 or 2, wherein a lower end portion of an air blow passage formed vertically inside the stopper valve is divided into a plurality of air passages extending in the left-right direction.   The valve raising / lowering driving device moves the stopper valve upward in a direction away from the valve seat by supplying air into the valve body, and extracts air inside the valve body by a spring force. The injection gun for a liquid injection device according to any one of claims 1 to 3, wherein the stopper valve is configured to move downward in a direction in contact with the valve seat.