JP6848157B2 - Spray gun - Google Patents

Description

The present invention relates to a spray gun.

Conventionally, a spray gun having a head and into which a liquid and a compressed gas are introduced is generally known.
For example, the spray gun of Patent Document 1 below is a gas rectified by a gap between the outer periphery of the gas passage through the nozzle and the main body baffle plate integrally molded at the tip of the gun main body in order to obtain a stable normal pattern of the spray pattern. Is supplied to the side gas flow path at the corner of the gas cap, and the side gas flow path adopts a rectifying structure in which the side gas flow path is gradually narrowed from the base toward the side gas hole. There is.

Japanese Unexamined Patent Publication No. 9-267060

However, in the spray gun described in Patent Document 1, the gas is rectified by the baffle plate, but since the baffle plate is integrally molded with the gun body, the space surrounded by the baffle plate and the gun body can be cleaned well. There was a problem that it could not be done.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a spray gun that is easy to clean while maintaining gas rectification by a flange portion corresponding to a baffle plate.

(1) In order to solve the above problems, the spray gun of the present invention is a spray gun including a gun body and a baffle ring that can be attached to and detached from the gun body, and the gun body is provided on the tip side. It has a tubular gun head portion having a first inner diameter and a second inner diameter smaller than the first inner diameter, and is integrally molded with the gun head portion so as to be located on the rear side of the gun head portion, and has a female screw on the inner peripheral wall. The baffle ring is provided with a tubular rib portion provided with the above rib portion and a gas supply hole formed in a part of the rib portion in the circumferential direction for supplying gas to the gun head portion side, and the baffle ring is an outer peripheral wall. Is provided with a male screw for screwing with the female screw, and is integrally molded with the base portion with a tubular base portion that can be attached to and detached from the rib portion by screwing the male screw and the female screw. A ring-shaped flange portion having a first outer diameter larger than the outer diameter of the gun head portion and a protruding portion integrally molded with the flange portion and projecting forward from the tip of the gun head portion are provided, and an inner peripheral wall of the gun head portion is provided. A gap is formed between the gas and the outer peripheral wall of the flange portion, and the baffle ring can be attached to and detached from the gun body when the baffle ring is rotated while the protruding portion is gripped. To do.

(2) In the configuration of (1) above, the gun body has a nozzle connecting portion that is located rearward of the gun head portion and is provided so as to penetrate the opening of the rib portion, and the base portion. A liquid nozzle attached to the nozzle connecting portion by screwing is provided so as to penetrate the opening of the flange portion, the protruding portion has a third inner diameter larger than the inner diameter of the flange portion, and the flange portion has the inner diameter of the flange portion. The liquid nozzle has a fourth inner diameter smaller than the third inner diameter, is capable of injecting a liquid, and has a tubular nozzle body attached to the nozzle connecting portion and the outer peripheral wall of the nozzle body in the circumferential direction. The enlarged diameter portion includes a packing portion having a second outer diameter smaller than the third inner diameter, and the enlarged diameter portion has a packing arrangement portion having a second outer diameter smaller than the third inner diameter and a third outer diameter larger than the second outer diameter. It has a movement restricting portion that is located on the front side of the packing disposing portion and is provided so as to be adjacent to the packing disposing portion, and has an outer peripheral wall of the packing disposing portion and the protruding portion. A ring-shaped packing is disposed between the inner peripheral wall and the outer peripheral wall of the packing arrangement portion and the inner peripheral wall of the protruding portion, and the packing is provided with at least the movement restricting portion in the front-rear direction. It is preferable that the movement restricting portion and the flange portion are sandwiched so as not to come into contact with any one of the flange portions.

(3) In the configuration of (2) above, the nozzle connecting portion has a first taper, and the nozzle body has a second taper for engaging with the first taper, and the liquid nozzle and the liquid nozzle. It is preferable that the portion where the gun body engages is only the portion where the first taper and the second taper engage.

(4) In any one of the above (1) to (3), it is preferable that the protruding portion has a pair of parallel planes formed on the outer peripheral wall.

According to the present invention, it is possible to provide a spray gun that is easy to clean while maintaining gas rectification by a flange portion corresponding to a baffle plate.

It is a schematic diagram of the whole of the spray gun of the embodiment which concerns on this invention. It is an exploded perspective view of the main part of the spray gun of the embodiment which concerns on this invention. It is an exploded sectional view of the main part of the spray gun of embodiment which concerns on this invention. It is sectional drawing of the main part of the spray gun of embodiment which concerns on this invention.

Hereinafter, embodiments for carrying out the present invention (hereinafter, referred to as “embodiments”) will be described in detail with reference to the accompanying drawings. The same elements are numbered the same throughout the description of the embodiment.
Further, in the following description, the expressions "tip" and "front" represent the position and direction of each member or the like near the injection port for injecting the liquid, and conversely, "rear end" and "rear". The expression "is" is used to indicate the position or direction on the side far from the injection port for injecting the liquid.

Hereinafter, the spray gun 1 of the embodiment according to the present invention will be described in detail with reference to FIGS. 1 to 4.

[Overall configuration of spray gun]
FIG. 1 is a schematic view showing the entire spray gun 1 of the embodiment according to the present invention.
Hereinafter, the overall configuration of the spray gun 1 according to the embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 1, the spray gun 1 of the embodiment according to the present invention mainly includes a gun body 2, a baffle ring 3, a liquid nozzle 4, a packing 5, a gas cap 6, and a cover 7. That is, the gun body 2, the baffle ring 3, the liquid nozzle 4, the packing 5, the gas cap 6 and the cover 7 form a main part of the spray gun 1.
The configuration of the main part of the spray gun 1 will be described later with reference to FIGS. 2 to 4.

Further, as shown in FIG. 1, the spray gun 1 of the embodiment according to the present invention is a needle valve 10 which is connected to a trigger 11 and opens and closes the liquid injection port 4a at the tip of the liquid nozzle 4 by operating the trigger 11. And a needle valve spring 12 that constantly urges the needle valve 10 toward the liquid injection port 4a.

Therefore, when the trigger 11 is not pulled, the needle valve 10 is urged by the needle valve spring 12 toward the liquid injection port 4a at the tip of the liquid nozzle 4. Therefore, the tip of the needle valve 10 is inserted into the liquid injection port 4a at the tip of the liquid nozzle 4, and the liquid injection port 4a is closed by the tip of the needle valve 10.
On the other hand, when the trigger 11 is pulled, the needle valve 10 moves to the rear end side in conjunction with the trigger 11, and the tip of the needle valve 10 comes out of the liquid injection port 4a at the tip of the liquid nozzle 4, so that the liquid injection port 4a Is in an open state, and when the liquid is supplied to the liquid injection port 4a, the liquid is injected from the liquid injection port 4a.

Further, a gas valve 13 for opening and closing the gas flow path is provided in conjunction with the trigger 11. Therefore, when the needle valve 10 is urged toward the liquid injection port 4a at the tip of the liquid nozzle 4 without operating the trigger 11, the flow of gas (gas) supplied from the gas supply port 14 is stopped. It has become like.
When the trigger 11 is pulled, the gas valve 13 first moves to the rear end side, the gas flow path is opened, the gas is supplied to the tip 23 of the gas flow path, and the gas supplied to the tip 23 of the gas flow path is , A ring-shaped gap formed between the atomizing gas outlet hole 61a described later and the outer diameter of the tip of the liquid nozzle 4 on the liquid injection port 4a side, the auxiliary gas outlet hole 61b, and the pattern adjusting gas outlet hole 62a. Then, when the trigger 11 is further pulled, when the liquid is supplied to the liquid injection port 4a, the liquid is injected from the liquid injection port 4a.

The amount of gas supplied to the pattern adjusting gas outlet hole 62a can be adjusted by the pattern gas adjusting knob 15.
Specifically, when the pattern gas adjusting knob 15 is rotated, the opening degree of the gas flow path to the pattern adjusting gas blowing hole 62a is changed by the gas adjusting needle 8, and the gas is supplied to the pattern adjusting gas blowing hole 62a. It can be adjusted to the fully closed state without gas.
Further, an overall gas adjusting knob 16 is provided in the vicinity of the gas supply port 14, and by adjusting the overall gas adjusting knob 16, the gas is sent to the gas valve 13 for opening and closing the gas flow path. It is possible to adjust the amount of gas.

Here, at the time of use, a liquid supply pipe (not shown) is connected to the liquid supply port 17, and the liquid is supplied from the liquid supply port 17 to the gap between the liquid nozzle 4 and the needle valve 10.
Further, since a gas supply pipe (not shown) is connected to the gas supply port 14 and the gas is supplied to the gas valve 13, when the trigger 11 is pulled, the gas outlet hole for atomization Gas is injected from the annular gap formed between the 61a and the outer diameter of the tip of the liquid nozzle 4 on the liquid injection port 4a side, the auxiliary gas outlet hole 61b, and the pattern adjustment gas outlet hole 62a, and then the liquid nozzle 4 The liquid is injected from the liquid injection port 4a at the tip.
The injected liquid is atomized (fog) by the gas injected from the annular gap formed between the atomizing gas outlet hole 61a and the outer diameter of the tip of the liquid nozzle 4 on the liquid injection port 4a side almost at the same time as the injection. The atomized liquid is turned into a atomized liquid, and the atomized liquid atomized (atomized) by the gas ejected from the pattern adjusting gas blowing hole 62a is adjusted to an elliptical pattern to form an auxiliary gas blowing hole 61b. The pattern is finely modified and adjusted with the gas injected from.
Then, when the trigger 11 is stopped, the injection of the liquid is stopped, and subsequently, an annular gap formed between the atomizing gas outlet hole 61a and the outer diameter of the tip of the liquid nozzle 4 on the liquid injection port 4a side. Then, the injection of the gas from the auxiliary gas blowing hole 61b and the pattern adjusting gas blowing hole 62a is also stopped.

[Structure of main parts of spray gun]
Next, the configuration of the main part of the spray gun 1 according to the embodiment of the present invention will be described in detail with reference to FIGS. 2 to 4.
FIG. 2 is a perspective view showing an exploded view of the main part of the spray gun 1 according to the embodiment of the present invention, and FIG. 3 is a cross-sectional view showing an exploded view of the main part of the spray gun 1 according to the present invention. FIG. 4 is a cross-sectional view showing a main part of the spray gun 1 according to the embodiment of the present invention.
Further, in FIGS. 3 and 4, the left side is the front and the right side is the rear.

As shown in FIGS. 2 to 4, the gun body 2 is provided on the tip side and has a tubular gun head portion 21 having a first inner diameter d1 and a second inner diameter d2 smaller than the first inner diameter d1. A tubular rib portion 22 located on the rear side of the portion 21 and a gas outlet hole 61a for atomizing gas from the gas supply port 14 and a tip outer diameter on the liquid injection port 4a side of the liquid nozzle 4 are formed. An annular gap, a tip 23 of a gas flow path for supplying to the auxiliary gas blowing hole 61b and the pattern adjusting gas blowing hole 62a, a nozzle connecting portion 24 located on the rear side of the gun head portion 21, and a gas flow. A gas branch for supplying the gas from the tip 23 of the path to the annular gap formed between the atomizing gas blowout hole 61a and the outer diameter of the tip of the liquid nozzle 4 on the liquid injection port 4a side and the auxiliary gas blowout hole 61b. A groove 25 is provided.

The gun head portion 21 is provided with a male screw 21a on its outer peripheral wall along a circumferential direction (hereinafter referred to as a circumferential direction) centered on the axis O, and the male screw 21a can be screwed with a female screw 71 described later. It is configured.

The rib portion 22 is integrally molded with the gun head portion 21, and a female screw 22a is provided on the inner peripheral wall thereof along the circumferential direction, and the female screw 22a is configured to be screwable with a male screw 31a described later. ..
Further, the inner peripheral wall of the rib portion 22 is provided with a taper 22b along the circumferential direction, and the taper 22b is located in front of the female screw 22a and is configured to be engaged with the taper 31b described later. ..
Further, a gas supply hole 22c is provided in a part of the rib portion 22 in the circumferential direction so as to penetrate the rib portion 22 along the extending direction of the axis O (hereinafter referred to as the axial direction). Since the gas supply hole 22c communicates the space on the gun head portion 21 side with the tip 23 of the gas flow path, gas from the tip 23 of the gas flow path can be supplied to the gun head portion 21 side (FIG. FIG. 4).

The nozzle connecting portion 24 is a tubular member that can be connected to the liquid nozzle 4, and is provided so as to penetrate the opening of the rib portion 22.
Further, since the nozzle connecting portion 24 comes into contact with a liquid such as paint, it is preferably made of a corrosion-resistant material such as stainless steel.
A female screw 24a is provided on the inner peripheral wall of the nozzle connecting portion 24 along the circumferential direction, and the female screw 24a is configured to be screwable with a male screw 41a described later.
Further, the inner peripheral wall of the nozzle connecting portion 24 is provided with a taper 24b (first taper) along the circumferential direction, and the taper 24b is located behind the female screw 24a and is described later. It is configured to be engageable with.

As shown in FIG. 4, the gas branch groove 25 communicates the tip 23 of the gas flow path with the gas branch flow path described later, so that the gas from the tip 23 of the gas flow path is connected to the gas branch flow path. Can be supplied.

As shown in FIGS. 3 and 4, the baffle ring 3 has a tubular base portion 31 that can be attached to and detached from the rib portion 22 by screwing a screw, and a first outer diameter D1 that is larger than the outer diameter of the base portion 31. A ring-shaped flange portion 32 having the above shape and a tubular protruding portion 33 projecting forward from the flange portion 32 are provided.

The base portion 31 has a male screw 31a for screwing with the female screw 22a on the outer peripheral wall, whereby the base portion 31 can be attached to and detached from the rib portion 22 by screwing the male screw 31a and the female screw 22a.
Further, the outer peripheral wall of the base portion 31 is provided with a taper 31b for engaging with the taper 22b so as to be located in front of the male screw 31a.

The flange portion 32 is integrally molded with the base portion 31 so as to be located in front of the base portion 31, and has a fourth inner diameter d4 larger than the inner diameter of the base portion 31.
When the base portion 31 is attached to the rib portion 22, as shown in FIG. 4, the space surrounded by the baffle ring 3, the gun head portion 21 and the rib portion 22 becomes the gas rectifying chamber 9, and further, the flange portion 32. A gap is formed between the outer peripheral wall of the gun head portion 21 and the inner peripheral wall on the tip end side of the gun head portion 21 facing the outer peripheral wall.
As described above, the gas rectifier chamber 9 corresponding to the space on the gun head portion 21 side communicates with the tip 23 of the gas flow path via the gas supply hole 22c. As a result, the gas supplied from the tip 23 of the gas flow path passes through the gap formed between the outer peripheral wall of the flange portion 32 and the inner peripheral wall on the tip side of the gun head portion 21 via the gas rectifying chamber 9. By doing so, it will be rectified.

The protruding portion 33 is integrally molded with the flange portion 32 so as to project forward from the flange portion 32, and has a third inner diameter d3 larger than the fourth inner diameter d4 of the flange portion 32.
A packing 5 is provided on the inner peripheral wall of the protruding portion 33 so as to be in contact with the inner peripheral wall. Then, on the rear side of the inner peripheral wall of the protruding portion 33, a flange portion 32 having a fourth inner diameter d4 smaller than the third inner diameter d3 of the protruding portion 33 is formed so as to be adjacent to the protruding portion 33. The rearward movement of the packing 5 is restricted.
That is, when the packing 5 moves rearward along the inner peripheral wall of the protruding portion 33, the packing 5 abuts on the inner edge side of the flange portion 32, thereby restricting the rearward movement of the packing 5.

Further, as shown in FIG. 4, the protruding portion 33 protrudes forward from the tip of the gun head portion 21.
Further, in this embodiment, the protrusion 33 is composed of a hexagonal portion (see FIG. 2), but the present invention is not limited to this, and for example, even if a pair of parallel planes is formed on the outer peripheral wall. Often, in this case, the baffle ring 3 may be rotatable in a state where a pair of parallel planes of the protrusions 33 are gripped by a standard tool or the like.

As described above, when the baffle ring 3 is rotated while the protruding portion 33 is gripped by a standard tool or the like, the baffle ring 3 can be easily attached to and detached from the gun body 2, and gas rectification blocked by the baffle ring 3 is achieved. The space of the room 9 can be easily cleaned.

As shown in FIGS. 2 to 4, the liquid nozzle 4 is attached to the nozzle connecting portion 24 so as to penetrate the opening of the base portion 31.
Further, the liquid nozzle 4 is composed of a nozzle body 41 capable of injecting liquid and can be attached to the nozzle connecting portion 24, a baffle plate 42 provided on the outer peripheral wall of the nozzle body 41 along the circumferential direction, and a baffle plate 42. Also has a diameter-expanded portion 43 provided along the circumferential direction on the outer peripheral wall of the nozzle body 41 so as to be located on the front side.

The nozzle body 41 extends along the axial direction, has an outer diameter smaller than the inner diameter of the base portion 31, and is provided with a male screw 41a for screwing with the female screw 24a on the outer peripheral wall on the rear end side. ing.
As a result, the nozzle body 41 can be attached to and detached from the nozzle connecting portion 24 by screwing so as to penetrate the opening of the base portion 31.
A gas branch flow path communicating with the tip 23 of the gas flow path is formed between the outer peripheral wall of the nozzle body 41 and the inner peripheral wall of the base portion 31 and the flange portion 32 of the baffle ring 3 facing the outer peripheral wall. There is.

Further, the outer peripheral wall of the nozzle body 41 is provided with a taper 41b (second taper) for engaging with the taper 24b so as to be located on the rear side of the male screw 41a.
Therefore, when the nozzle body 41 is attached to the nozzle connecting portion 24 by screwing, liquid such as paint leaks from the connecting portion between the nozzle body 41 and the nozzle connecting portion 24 due to the engagement between the taper 24b and the taper 41b. Can be reliably prevented.
The liquid nozzle 4 and the gun body 2 are only engaged with the taper 24b of the nozzle connecting portion 24 and the taper 41b of the nozzle body 41.

The baffle plate 42 is integrally molded with the nozzle body 41 so as to be located on the rear side of the enlarged diameter portion 43, and has an outer diameter larger than the outer diameter of the nozzle body 41 and smaller than the inner diameter of the base portion 31. Have.
As shown in FIG. 4, in the gas branch flow path, a gap for rectifying the gas is formed between the outer peripheral wall of the baffle plate 42 and the inner peripheral wall of the base portion 31 facing the outer peripheral wall.
As a result, the gas supplied from the tip 23 of the gas flow path enters the gas branch flow path through the gas branch groove 25 separately from the gas supply hole 22c, and enters the outer peripheral wall of the baffle plate 42 and the inside of the base portion 31. It will be rectified by passing through the gap formed between it and the peripheral wall.

The enlarged diameter portion 43 includes a packing arrangement portion 43a having a second outer diameter D2 smaller than the third inner diameter d3 of the protruding portion 33, and a third outer diameter larger than the second outer diameter D2 and smaller than the third inner diameter d3. It has a diameter D3, a movement restricting portion 43b located on the front side of the packing disposing portion 43a and adjacent to the packing disposing portion 43a, and an outer diameter larger than the third outer diameter D3. It also has a front side portion 43c provided so as to be located on the front side of the movement restricting portion 43b, and a plurality of through holes 43d penetrating the diameter-expanded portion 43 along the axial direction.

The packing 5 is arranged so as to be in contact with the outer peripheral wall of the packing arrangement portion 43a. Then, on the front side of the outer peripheral wall of the packing arrangement portion 43a, a movement restriction having a third outer diameter D3 larger than the second outer diameter D2 of the packing arrangement portion 43a so as to be adjacent to the packing arrangement portion 43a. The formation of the portion 43b restricts the forward movement of the packing 5.
That is, when the packing 5 moves forward along the outer peripheral wall of the packing arrangement portion 43a, the packing 5 abuts on the movement restricting portion 43b to restrict the forward movement of the packing 5.

A taper 43e that can be engaged with a ring-shaped taper 63, which will be described later, is provided on the tip end side of the front side portion 43c.

The plurality of through holes 43d form an annular gap formed between the gas outlet hole 61a for atomizing the gas supplied through the gas branch flow path and the outer diameter of the tip of the liquid nozzle 4 on the liquid injection port 4a side. , It is supplied to the auxiliary gas outlet hole 61b, and is provided at a predetermined distance from each other in the circumferential direction.

As shown in FIG. 4, the ring-shaped packing 5 is arranged between the inner peripheral wall of the protruding portion 33 and the outer peripheral wall of the packing disposing portion 43a facing the inner peripheral wall.
Specifically, the packing 5 has the protrusion 33 and the packing along the circumferential direction so that the outer peripheral wall and the inner peripheral wall of the packing 5 come into contact with the inner peripheral wall of the protruding portion 33 and the outer peripheral wall of the packing disposing portion 43a, respectively. It is arranged between the arrangement portion 43a and the arrangement portion 43a.
In other words, the enlarged diameter portion 43 of the liquid nozzle 4 is held by the baffle ring 3 via the packing 5.
Therefore, the packing 5 can be easily attached to and detached from the inner peripheral wall of the protruding portion 33 without using a special tool.

Further, the packing 5 is sandwiched between the movement restricting portion 43b and the flange portion 32 so as not to come into contact with at least one of the movement restricting portion 43b and the flange portion 32 in the front-rear direction (axial direction). ..
That is, the distance r from the rear end surface of the movement restricting portion 43b to the front end surface of the flange portion 32 is formed to be larger than the width t of the packing 5 in the front-rear direction (axial direction). Therefore, the packing 5 is not pressed or deformed by tightening the male screw 41a of the nozzle body 41 and the female screw 24a of the nozzle connecting portion 24 in the front-rear direction (axial direction), and is reliable as a sealing material. The sex can be improved.

In this embodiment, the packing 5 is sandwiched between the movement restricting portion 43b and the flange portion 32 so as to be in contact with the movement restricting portion 43b but not with the flange portion 32 in the front-rear direction (axial direction). (See Fig. 4).

Further, the packing 5 has a groove 5a formed along the circumferential direction on a surface (rear end surface) facing the flange portion 32.
Therefore, the gas supplied from the tip 23 of the gas flow path via the gas branch flow path enters the groove 5a, thereby pressing the inner peripheral wall of the packing 5 against the outer peripheral wall of the packing arrangement portion 43a, and at the same time. Since the outer peripheral wall of the packing 5 is pressed against the inner peripheral wall of the protruding portion 33, the sealing effect of the packing 5 can be enhanced.

As described above, since the liquid nozzle 4 uses the taper 41b at the connecting portion with the nozzle connecting portion 24 and the packing 5 at the joint portion with the protruding portion 33 of the baffle ring 3, the connecting portion with the nozzle connecting portion 24. The reliability of the sealing effect can be improved as compared with the case where a taper is used at any of the joints with the baffle ring 3.
That is, when the liquid nozzle 4 uses a taper at both the connection portion with the nozzle connecting portion 24 and the joint portion with the baffle ring 3, the male screw 41a of the nozzle body 41 and the female screw 24a of the nozzle connecting portion 24 are tightened. Depending on the adjustment, even if the taper at one location engages well, the taper at the other location may not engage well. On the other hand, in this embodiment, the liquid nozzle 4 has the taper 41b as described above. By using the combination with the packing 5, it is possible to solve the problem that the taper does not engage well.

Further, when a taper is used at both the connection portion with the nozzle connecting portion 24 and the joint portion with the baffle ring 3, high manufacturing accuracy is required for each part in order to engage the two tapers together. In this embodiment, since it is not necessary to engage the two tapers together, high-precision manufacturing is not required, and each component constituting the spray gun 1 can be easily manufactured.

As shown in FIGS. 2 and 3, the gas cap 6 has a cap main body 61, a pair of corner portions 62 provided on the cap main body 61, and a ring-shaped taper 63 protruding rearward from the back surface of the cap main body 61. Has.

The cap body 61 has an atomizing gas blowing hole 61a and a plurality of auxiliary gas blowing holes 61b for discharging the gas supplied through the plurality of through holes 43d of the nozzle body 41 to the outside.

The pair of corner portions 62 have a plurality of pattern adjustments for discharging the gas supplied through the gap formed between the outer peripheral wall of the flange portion 32 and the inner peripheral wall on the tip end side of the gun head portion 21 to the outside. It has a gas outlet hole 62a.

As described above, the ring-shaped taper 63 is for engaging with the taper 43e of the diameter-expanded portion 43, and as shown in FIG. 4, the taper 63 of the gas cap 6 and the taper 43e of the diameter-expanded portion 43e. Gas supplied through the plurality of through holes 43d of the nozzle body 41 by engagement with, and a gap formed between the outer peripheral wall of the flange portion 32 and the inner peripheral wall on the tip end side of the gun head portion 21. The gas supplied through the above means is surely formed between the atomizing gas outlet hole 61a and the outer diameter of the tip of the liquid nozzle 4 on the liquid injection port 4a side without being mixed, and a plurality of annular gaps. The gas is discharged from the auxiliary gas blowing holes 61b and the plurality of pattern adjusting gas blowing holes 62a.

The cover 7 has a female screw 71 provided on the inner peripheral wall on the rear end side for screwing with the male screw 21a, a packing arrangement groove 72 provided on the inner peripheral wall so as to be located in front of the female screw 71, and a packing. It has a cover packing 73 that is fitted in the arrangement groove 72 and can come into contact with the outer peripheral wall of the gun head portion 21.

As shown in FIG. 4, the cover packing 73 is arranged between the packing arrangement groove 72 of the cover 7 and the outer peripheral wall of the gun head portion 21, and thus functions as a sealing material to form the flange portion 32. The gas supplied through the gap formed between the outer peripheral wall and the inner peripheral wall on the tip end side of the gun head portion 21 is more reliably discharged from the plurality of pattern adjusting gas outlet holes 62a.

Although the present invention has been described above using the embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope of the invention described in the above embodiments. It will be apparent to those skilled in the art that improvements can be made. Further, it is clear from the description of the scope of claims that the form to which such a modification or improvement is added may be included in the technical scope of the present invention.

1 Spray gun 2 Gun body 3 Baffle ring 4 Liquid nozzle 4a Liquid injection port 5 Packing 5a Groove 6 Gas cap 7 Cover 8 Gas adjustment needle 9 Gas rectifier chamber 10 Needle valve 11 Trigger 12 Needle valve spring 13 Gas valve 14 Gas supply Port 15 Pattern Gas adjustment knob 16 Overall gas adjustment knob 17 Liquid supply port 21 Gun head part 21a Male screw 22 Rib part 22a Female screw 22b Tapered 22c Gas supply hole 23 Gas flow path tip 24 Nozzle connection part 24a Female screw 24b Tapered (first taper)
25 Gas branch groove 31 Base part 31a Male thread 31b Taper 32 Flange part 33 Protruding part 41 Nozzle body 41a Male thread 41b Taper (second taper)
42 Baffle plate 43 Diameter expansion part 43a Packing arrangement part 43b Movement regulation part 43c Front side part 43d Through hole 43e Tapered 61 Gas cap body 61a Atomizing gas blowing hole 61b Auxiliary gas blowing hole 62 Square part 62a Gas blowing hole for pattern adjustment 63 Tapered 71 Female screw 72 Packing arrangement groove 73 Cover packing D1 1st outer diameter D2 2nd outer diameter D3 3rd outer diameter O axis d1 1st inner diameter d2 2nd inner diameter d3 3rd inner diameter d4 4th inner diameter r Distance t width

Claims (4)

A spray gun having a gun body and a baffle ring that can be attached to and detached from the gun body.
The gun body is
A tubular gun head part provided on the tip side and having a first inner diameter,
A tubular rib portion having a second inner diameter smaller than the first inner diameter, integrally molded with the gun head portion so as to be located on the rear side of the gun head portion, and a female screw on the inner peripheral wall.
It is formed in a part of the rib portion in the circumferential direction, and is provided with a gas supply hole for supplying gas to the gun head portion side.
The baffle ring
A male screw for screwing with the female screw is provided on the outer peripheral wall, and a tubular base portion that can be attached to and detached from the rib portion by screwing the male screw and the female screw, and a tubular base portion.
A ring-shaped flange portion integrally molded with the base portion and having a first outer diameter larger than the outer diameter of the base portion.
It is integrally molded with the flange portion and has a protruding portion that protrudes forward from the tip of the gun head portion.
A gap is formed between the inner peripheral wall of the gun head portion and the outer peripheral wall of the flange portion.
The spray gun is characterized in that the baffle ring can be attached to and detached from the gun body when the baffle ring is rotated while the protruding portion is gripped. The gun body has a nozzle connecting portion that is located on the rear side of the gun head portion and is provided so as to penetrate the opening of the rib portion.
A liquid nozzle attached to the nozzle connecting portion by screwing is provided so as to penetrate the opening of the base portion.
The protruding portion has a third inner diameter larger than the inner diameter of the flange portion.
The flange portion has a fourth inner diameter smaller than the third inner diameter.
The liquid nozzle
A tubular nozzle body that can inject liquid and is attached to the nozzle connecting portion,
The outer peripheral wall of the nozzle body is provided with a diameter-expanded portion provided along the circumferential direction.
The enlarged diameter portion
A packing arrangement portion having a second outer diameter smaller than the third inner diameter, and
It has a third outer diameter that is larger than the second outer diameter, has a movement restricting portion that is located on the front side of the packing disposing portion and is provided adjacent to the packing disposing portion.
A ring-shaped packing is arranged between the outer peripheral wall of the packing arrangement portion and the inner peripheral wall of the protruding portion so as to abut the outer peripheral wall of the packing arrangement portion and the inner peripheral wall of the protruding portion.
The claim is characterized in that the packing is sandwiched between the movement restricting portion and the flange portion so as not to come into contact with at least one of the movement restricting portion and the flange portion in the front-rear direction. Item 1. The spray gun according to item 1. The nozzle connecting portion has a first taper and has a first taper.
The nozzle body has a second taper for engaging with the first taper.
The spray gun according to claim 2, wherein the liquid nozzle and the gun body are engaged only at a portion where the first taper and the second taper are engaged. The spray gun according to any one of claims 1 to 3, wherein the protruding portion has a pair of parallel planes formed on the outer peripheral wall.

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