JPS644443Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a spray gun for spraying a spray liquid such as a chemical solution in the form of a mist using pressurized air, and is particularly designed to prevent leakage of the spray liquid and time delay at the start of spraying due to air displacement. Regarding the structure of

A typical spray gun is used with a direct connection to a container of spray liquid. Therefore, since the spray liquid is immediately supplied into the nozzle at the start of spraying, there is almost no time delay during spraying.

However, when the spray liquid container is installed at a location away from the spray gun, air enters the spray liquid container from the nozzle while the spraying operation is stopped, and the passage is replaced by air. and,
During subsequent injections, the spray liquid is not immediately sent into the nozzle, so the actual injection operation is performed after the air is discharged, resulting in a time-delayed state.

When the sprayed liquid is a medicinal solution such as a vaccine, the amount of sprayed is determined, so this time delay makes it impossible to accurately determine the spraying time and becomes an obstacle to quantitative spraying.

Therefore, the purpose of this invention is to prevent outside air from entering the spray liquid container and the liquid introduction pipe during the suspension period of the spray operation, and to prevent a time delay during the subsequent spray operation. At the same time, the purpose is to prevent leakage of the spray liquid.

Based on the above object, the present invention closes the passage of the spray liquid when the spray operation is interrupted, thereby preventing air displacement and leakage of the spray liquid.

By the way, if the spray liquid is a vaccine, etc.
In each case, operations such as sterilization by boiling are required. Disinfection for this purpose is carried out by removing the nozzle head and the introduction pipe for the spray liquid from the spray gun, but in this case the needle valve is usually exposed to the outside, making it easy to damage and dangerous.

Therefore, another object of the present invention is to separate the needle valve in the nozzle head from the spray liquid introduction pipe attached to the rear end of the spray gun, thereby preventing damage to the needle valve during disinfection or creating a dangerous situation. The goal is to prevent

Hereinafter, the configuration of the present invention will be specifically explained based on a suitable embodiment shown in the drawings.

The spray gun 1 of the present invention has a main body 2 as the main structural part. This main body 2 is provided with a storage hole 3 and a piston chamber 4 that pass through it from front to back. The housing hole 3 is connected to a nozzle head 6 through a screw 5 with an O-ring 7 interposed therebetween at its distal end, that is, on the head side, and to a guide sleeve 9 through a screw 8 at its rear end. Further, the piston chamber 4 accommodates a piston 11 having an O-ring 10 therein, and a screw 1.
2 to the tail nut 13. This tail nut 13 is attached to the cap 1 by means of a screw 14.
5, and furthermore, this cap 15 is
It is connected to a ring 17 inside the tail nut 13 by a screw 16. The piston 11 is urged in the forward direction by a compression spring 18 provided between the piston 11 and the tail nut 13.
A part of the ring 17 is slidably supported in the axial direction. Moreover, this piston 11 is
A guide hole 21 is provided at the center, and this guide hole 21 is connected to the piston valve 20 inside the storage hole 3 by a screw 19 with a packing 63 interposed therebetween. This piston valve 20 has a hole 22 at the center, and is airtightly provided on the inner peripheral surface of the storage hole 3 by an O-ring 62 on the outer periphery.

A liquid introduction pipe 24 for guiding the injection liquid 23 is inserted into the guide hole 21 and the hole 22. The liquid introduction pipe 24 is always biased to the left by a compression spring 26 provided between the spring receiver 25 and the cap 15. Further, the piston valve 20 is inserted into the guide sleeve 9 while passing through the annular packing 27 and forming a sufficient gap.
When the packing 27 is pressed against the tip of the guide sleeve 9, communication between the storage hole 3 and the air passage 28 is cut off. Note that a communication hole 29 is provided in the cylindrical portion of the piston valve 20, and the hole 22 is connected to the piston chamber 4 and the air passage 28 through this.

The nozzle head 6 has an air chamber 30 formed therein, and this air chamber 30 communicates with the storage hole 3 through a passage 31 at its rear end, and is connected to the storage hole 3 through a screw 32 at the tip with an O-ring 33 interposed therebetween. It is also connected to the main nozzle 34. A needle case 35 is provided inside the air chamber 30. This needle case 35 communicates the air chamber 30 and the passage 31 through a groove 36 on the outer peripheral surface, and also forms a liquid chamber 37 inside. The liquid chamber 37 fits into the auxiliary nozzle 39 with an O-ring 38 interposed at its tip, and a needle valve 41 is housed therein by a holder 40 so as to be slidable in the axial direction. This holder 40 is always urged in the backward direction by a biasing spring 42, but is prevented from retreating any further by hitting the tip of the liquid introduction pipe 24 inserted into the inside of the liquid chamber 37. It's summery. Note that the injection liquid 23 inside the liquid introduction pipe 24 communicates with the auxiliary nozzle hole 44 of the auxiliary nozzle 39 from the notch 48 at the tip of the liquid introduction pipe 24 through the hole 43 of the holder 40 . Further, the needle valve 41 includes a large diameter portion 41a and a small diameter portion 41b. This large diameter portion 41a
When the gasket 45 is fitted into the gasket 45 provided at the rear end of the auxiliary nozzle hole 44, communication between the liquid chamber 37 and the auxiliary nozzle hole 44 is interrupted. The tip portion of the auxiliary nozzle 39 faces the inside of the nozzle hole 46 of the main nozzle 33. Also, this nozzle hole 46
communicates with the air chamber 30 via a plurality of spiral grooves 47 provided on the outer periphery of the auxiliary nozzle 39.

Furthermore, a connection port 49 for pressurized air 64 is provided in the grip portion of the main body 2. This connection port 49
communicates with the valve chamber 51 via an air passage 50. This valve chamber 51 is connected to a nut 54 by a screw 53 with a seat 52 stored therein. This nut 54 slidably supports a trigger rod 55.
The tip portion of 5 is in contact with a globe valve 56. This globe valve 56 is in contact with a packing 57 provided on the seat 52 by the biasing force of a spring 58. Note that O-rings 59 and 60 are provided at the positions of the nut 54 and trigger rod 55, respectively. These trigger rods 5
5, the seat 52 and the globe valve 56 constitute an opening/closing trigger means.

In this way, the air passage 50 is connected to the air passage 28 via the communication passage 61 of the seat 52, and finally to the front chamber of the piston chamber 4.

Next, the operation of the spray gun 1 will be explained.

When the operator continues to press the trigger rod 55,
Since the globe valve 56 is separated from the packing 57, the pressurized air 64 passes through the air passage 50, the communication passage 61, and the air passage 28, and then enters the storage hole 3 and the piston chamber 4.
flows into the interior of. When the pressure of the pressurized air 64 is higher than necessary, the piston 11 is pushed by the pressurized air 64 and retreats together with the piston valve 20 against the elasticity of the compression spring 18. It is pressed against the guide sleeve 9 to prevent the compressed air 64 from flowing in. In this way, the pressure of the pressurized air 64 inside the storage hole 3 and the piston chamber 4 is automatically adjusted.
Therefore, even if the pressure of the pressurized air 64 is higher than a prescribed pressure value, it is used in a state in which the pressure is reduced to a prescribed pressure value due to its pressure reducing function.

Now, the pressurized air 64 flows from the communication hole 29 to the hole 22.
followed by passage 31, groove 36, and air chamber 30.
It passes through the spiral groove 47 and is injected to the outside from the nozzle hole 46 of the main nozzle 34 while forming a vortex. At this time, since negative pressure is generated in the auxiliary nozzle hole 44, the spray liquid 23 is sucked up from the container etc., and the notch 48,
It passes through the hole 43 and enters the inside of the liquid chamber 37 .

As already mentioned, the piston 11 moves back a little at the balance position between the pressure of the compressed air 48 and the pressure of the compression spring 18, hits the spring receiver 25 at its rear end, and moves the liquid introduction pipe 24 slightly backward. It's being pushed back. For this reason, the biasing spring 42
is pushing down the holder 40 and needle valve 41 rearward. Therefore, since the small diameter part 41b of the needle valve 41 is located at the position of the packing 45 and forms a gap therebetween, the spray liquid 23 inside the liquid chamber 37 passes between the small diameter part 41b and the packing 45. As a result, it is injected from the auxiliary nozzle hole 44 together with the vortex jet air in the form of mist.

When the operator releases the pressure on the trigger rod 55, the pressurized air 64 is blocked by the globe valve 56 and no longer flows into the piston chamber 4. Therefore, the piston 11 is pushed by the compression spring 18 and immediately moves in the direction of the guide sleeve 9. At this time, the compression spring 26 pushes the spring receiver 25 and moves the liquid introduction pipe 24 toward the tip. For this reason, the liquid introduction pipe 24
touches the holder 40 at its tip, moves the needle valve 41 forward against the biasing spring 42, and presses its large diameter portion 41a against the packing 45. At this time, communication between the liquid chamber 37 and the auxiliary nozzle hole 44 is interrupted by the gasket 45. As a result, the atmosphere is unable to enter the liquid chamber 37 from the inside of the auxiliary nozzle hole 44. Therefore, the atmosphere does not enter the inside of the liquid introduction pipe 24, and the remaining spray liquid 23 inside the liquid introduction pipe 24 is not replaced with air, so even when injection is interrupted, the spray liquid 23 remains inside the liquid introduction pipe 24. will remain there. Further, the sprayed liquid 23 inside the liquid introduction pipe 24 does not flow out into the auxiliary nozzle hole 44 because of the closed state at the gasket 45, so that liquid leakage can be reliably prevented.

In addition, if the inside of the nozzle head 6 or the inside of the liquid introduction pipe 24 needs to be cleaned or disinfected after the spraying work of the spray liquid 23 is completed, remove the nozzle head 6 from the main body 2 using the screw 5. Also, by removing the tail nut 13 from the main body 2 at the screw 12 or the cap 15 at the screw 14, the parts held by them are separated into the front end and rear end. You can take it out with Disinfection, for example by boiling, can therefore be carried out easily over the details of each part. In particular, since the needle valve 41 is constructed separately from the liquid introduction pipe 24, it is not exposed to the outside during disinfection work, and therefore damage and dangerous conditions can be prevented. Furthermore, if the needle valve 41 breaks down, it is sufficient to replace only that part, so there is no need to replace the liquid introduction pipe 24 or the parts attached around it, which makes maintenance easier. Become.

In the above embodiment, the needle case 35 is constructed separately from the nozzle head 6, but both
It may be configured integrally. When the two are integrated, the air chamber 30 communicates with the storage hole 31 through a hole drilled in the nozzle head 6 or the like.

According to this invention, when the spraying operation is interrupted, the auxiliary nozzle hole is closed by the needle valve and the gasket, so there is no liquid leakage, and since air does not enter the liquid introduction pipe, the subsequent injection is delayed. It can be carried out quickly without the need for water, and by making the spraying time constant, it is possible to spray a fixed amount, and since the front end and the rear end are separated, disinfection and cleaning are facilitated.

[Brief explanation of the drawing]

The figure is a vertical sectional view of the spray gun of the present invention. 1... Spray gun, 2... Main body, 3... Storage hole, 4... Piston chamber, 6... Nozzle head, 9
...Guide sleeve, 11...Piston, 18...
...Compression spring, 20...Piston valve, 23...
... Injection liquid, 24 ... Liquid introduction pipe, 26 ... Compression spring, 33 ... Main nozzle, 34 ... Main nozzle, 39 ... Auxiliary nozzle, 41 ... Needle valve,
42...Biasing spring, 45...Putskin, 64...
pressure air.

Claims (1)

[Scope of utility model registration request] A ring-shaped packing 45 is provided at the inner rear end of the auxiliary nozzle 39 in the nozzle head 6.
A needle valve 41 is inserted into the auxiliary nozzle 39 from the rear so as to be movable forward and backward.
The auxiliary nozzle hole 44 of the needle valve 4
The large diameter portion 41a at the rear end of the needle valve 41 is adapted to be freely attached to and detached from the inner peripheral surface of a packing 45 from the rear.
The needle valve 41 is urged rearward by the elasticity of the urging spring 42, and a liquid introduction pipe 24 separate from the needle valve 41 is provided so as to be movable back and forth inside the passage 31 of the nozzle head 6 and inside the housing hole 3 of the main body 2 which is integral with the nozzle head 6. The liquid introduction pipe 24 is fixed to the piston 11 which is housed in the piston chamber 4 of the main body 2 so as to be movable back and forth and which is urged in the forward direction by the compression spring 18. The tip of the liquid introduction pipe 24 is brought into contact with the rear end of the needle valve 41 by the elasticity of the compression spring 18. Further, the front chamber of the piston chamber 4 is filled with compressed air 6.
4 is connected to the air supply passages 28, 50, and an opening/closing trigger means 5 is provided in the air passages 28, 50.
2, 55, and 56 are provided, and the piston 11 and the liquid introduction pipe 24 are moved backward by the supply of compressed air 64, the needle valve 41 is moved backward by the biasing spring 42, and the passage of the injection liquid 23 is opened by the packing 45 and the auxiliary nozzle hole 44. Also, when the supply of the compressed air 64 is stopped, the piston 11 and the liquid introduction pipe 24 are moved backward.
is advanced by a compression spring, pushing and advancing a needle valve, causing the large diameter portion to close the inside of a packing, and causing the tip of the needle valve to close an auxiliary nozzle hole.