TW201904669A - spray gun - Google Patents

Abstract

This spray gun comprises a gun body and a baffle ring that can be attached to and detached from the gun body. The gun body comprises: a gun head part provided on the tip end side, the gun head part having a first inner diameter; a rib part having a second inner diameter that is less than the first inner diameter, the rib part being integrally formed with the gun head part so as to be positioned rearward of the gun head part; and a gas supply hole formed in a part in the circumferential direction of the rib part, the gas supply hole supplying a gas toward the gun head part. The baffle ring comprises a base part that can be attached to and detached from the rib part by screwing, a flange part having a first outer diameter that is greater than the outer diameter of the base part, and a projecting part that projects farther forward than the tip end of the gun head part. A gap is formed between the inner circumferential wall of the gun head part and the outer circumferential wall of the flange part.

Description

spray gun

This invention relates to spray guns.

Conventionally, a spray gun having a head and a liquid and a compressed gas introduced therein is generally known. For example, in the spray gun of the following Patent Document 1, in order to obtain a normal mode in which the spray mode is stabilized, a gas that is rectified at a periphery of the nozzle through the gas passage and integrally formed at the tip end of the gun body is supplied to the gas cap. The side gas flow path of the corner portion is a rectifying structure in which a hole shape whose stage portion is gradually reduced toward the side gas hole is formed. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. Hei 9-267060

[Problems to be solved by the invention]

However, in the lance described in Patent Document 1, although the gas rectification is performed by the baffle plate, since the baffle plate is integrally formed with the lance body, there is a problem that the space surrounded by the baffle plate and the gun body cannot be effectively washed.

In view of the above-described problems, the present invention has been made in an effort to provide a spray gun that is easy to clean while maintaining the rectification of gas. [Means for solving problems]

In order to solve the above problems, a spray gun according to the present invention includes a gun body and a spray gun that can be detached from the buffer ring of the gun body, and the gun body includes a tubular gun head and is disposed at the distal end side. The first inner diameter has a cylindrical rib having a second inner diameter smaller than the first inner diameter, and is integrally formed with the gun head at a rear side of the gun head, and is provided on the inner peripheral wall. And a gas supply hole formed in a portion of the circumferential direction of the rib for supplying gas to the gun head side, wherein the buffer ring has a cylindrical base portion and is provided on the peripheral wall The external thread for screwing the internal thread is disengaged from the rib by the external thread and the internal thread; the annular flange portion is integrally formed on the base and has a larger outer diameter than the base The first outer diameter and the protruding portion are integrally formed with the flange portion, and protrude further forward than the tip end of the gun head, and are formed between the inner peripheral wall of the gun head and the peripheral wall of the flange portion. With a gap, the above buffer ring holds the above protrusion In the state of the portion, when rotating, it is detachable from the gun body.

Hereinafter, the form for carrying out the present invention (hereinafter referred to as "embodiment") will be described in detail with reference to the accompanying drawings. Further, the same components are denoted by the same reference numerals throughout the description of the embodiments. In the following description, the expressions of "front end" and "front side" are used to indicate the position and direction of the injection port side for ejecting liquid in each member or the like, and conversely, "back end" and "rear". The performance is used to indicate the position and direction from the far side of the injection port for ejecting liquid.

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

[Structure of the entire spray gun] Fig. 1 is a schematic view showing the entire spray gun 1 according to the embodiment of 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. 1 .

The spray gun 1 according to the embodiment of the present invention is mainly shown in Fig. 1, and mainly includes a gun body 2, a buffer ring 3, a liquid nozzle 4, a gasket 5, a gas cap 6, and a lid 7. That is, the gun body 2, the buffer ring 3, the liquid nozzle 4, the gasket 5, the gas cap 6, and the cover 7 constitute a main portion of the spray gun 1. Further, the configuration of the main portion of the spray gun 1 will be described later with reference to FIGS. 2 to 4 .

Further, the spray gun 1 according to the embodiment of the present invention is a needle valve 10 including a switch that is connected to the trigger 11 and that operates the liquid injection port 4a at the tip end of the liquid nozzle 4 by the operation of the trigger 11, and the needle valve 10 is provided. The needle valve spring 12 that is constantly pushed toward the liquid ejection port 4a side.

Therefore, when the trigger 11 is not buckled, the needle valve 10 is pushed toward the liquid ejection opening 4a side of the tip end of the liquid nozzle 4 by the needle valve spring 12. Therefore, the tip end portion of the needle valve 10 is inserted into the liquid ejection port 4a at the tip end of the liquid nozzle 4, and the liquid ejection port 4a is closed at the tip end portion of the needle valve 10. On the other hand, when the trigger 11 is pulled, the needle valve 10 moves in conjunction with the trigger 11 to the rear end side, and the tip end portion of the needle valve 10 is pulled out from the liquid ejection opening 4a at the tip end of the liquid nozzle 4, so that the liquid ejection opening 4a is opened. When the liquid is supplied to the liquid ejection port 4a, the liquid is ejected from the liquid ejection port 4a.

Further, a gas valve 13 for the gas flow path switch is provided in conjunction with the trigger 11. Therefore, when the trigger 11 needle valve 10 is not operated, the flow of the gas (gas) supplied from the gas supply port 14 is stopped when it is pushed toward the liquid injection port 4a toward the tip end of the liquid nozzle 4. When the trigger 11 is pulled down, the gas valve 13 is first moved to the rear end side, the gas flow path is opened, gas is supplied to the tip end 23 of the gas flow path, and the gas supplied to the tip end 23 of the gas flow path is formed from the atomization described later. An annular gap between the gas ejection hole 61a and the outer diameter of the tip end of the liquid ejection opening 4a of the liquid nozzle 4, and the auxiliary gas ejection hole 61b and the mode adjustment gas ejection hole 62a are ejected, and when the trigger 11 is further buckled, When the liquid is supplied to the liquid ejection port 4a, the liquid is ejected from the liquid ejection port 4a.

Further, the gas supply amount to the mode adjustment gas discharge hole 62a is adjustable by the mode gas adjustment knob 15. Specifically, when the mode gas adjusting knob 15 is rotated, the opening of the gas flow path of the mode adjusting gas discharge hole 62a is changed by the gas adjusting needle 8, and the gas discharge mode adjusting gas discharge hole 62a can be fully closed. status. Further, in the vicinity of the gas supply port 14, an integral gas adjustment knob 16 is provided to adjust the overall gas adjustment knob 16, whereby the amount of gas supplied to the gas valve 13 for the gas flow path switch can be adjusted.

Here, at the time of use, the liquid supply port 17 is connected to a liquid supply pipe (not shown) to supply the liquid from the liquid supply port 17 to the gap between the liquid nozzle 4 and the needle valve 10. Further, a gas supply pipe (not shown) is connected to the gas supply port 14 to form a state in which gas is supplied to the gas valve 13, and therefore, when the trigger 11 is pulled, gas is formed from the atomizing gas discharge hole 61a and the liquid nozzle 4 The annular gap between the outer diameters of the tips of the liquid ejection ports 4a and the auxiliary gas ejection holes 61b and the mode adjusting gas ejection holes 62a are ejected, and then the liquid is ejected from the liquid ejection ports 4a at the tip end of the liquid nozzles 4. Further, the liquid after the injection is ejected by a gas which is ejected from an annular gap formed between the atomizing gas ejection hole 61a and the outer diameter of the tip end of the liquid ejection port 4a of the liquid nozzle 4 at substantially the same time as the ejection. The micronized liquid is atomized (atomized) to form a micronized liquid, and the atomized liquid after atomization (atomization) of the gas ejected from the mode adjusting gas ejection hole 62a is adjusted in an elliptical pattern, and is ejected as an auxiliary gas. The gas micro-correction mode injected by the hole 61b is adjusted. When the trigger 11 is stopped, the ejection of the liquid is stopped, and then the gas is formed in an annular gap between the atomizing gas ejection hole 61a and the outer diameter of the tip end of the liquid ejection port 4a of the liquid nozzle 4, and the auxiliary gas. The ejection of the discharge hole 61b and the mode adjustment gas discharge hole 62a also stops.

[Configuration of Main Part of the 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 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 the main part of the spray gun 1 according to the embodiment of the present invention, and Fig. 4 is a view showing the main part of the spray gun 1 according to the embodiment of the present invention. A cross-sectional view of a main part of the spray gun 1 according to the embodiment of the present invention. In addition, in the third figure and the fourth figure, the left side is the front side, and the right side is the rear side.

As shown in FIGS. 2 to 4, the gun body 2 includes a cylindrical gun head 21 which is provided on the distal end side and has a first inner diameter d1, and a cylindrical rib 22 having a first inner diameter d1. The small second inner diameter d2 is located on the rear side of the gun head 21; the annular gap forms the gas from the gas supply port 14 in the atomizing gas discharge hole 61a and the liquid injection port 4a side of the liquid nozzle 4 Between the outer diameters; the front end 23 of the gas flow path is supplied to the auxiliary gas discharge hole 61b and the mode adjustment gas discharge hole 62a; the nozzle connection portion 24 is located further to the rear side than the gun head portion 21; and the gas branch groove 25 The gas supply from the tip end 23 of the gas flow path is formed in the annular gap between the atomizing gas discharge hole 61a and the outer diameter of the tip end of the liquid nozzle 4 on the liquid injection port 4a side, and the auxiliary gas discharge hole 61b.

The gun head 21 is provided with a male screw 21a in a circumferential direction around the axis O (hereinafter referred to as a circumferential direction), and the male screw 21a is configured to be screwed into an internal thread 71 of a cover 7 to be described later.

The rib 22 is integrally formed with the gun head portion 21, and an inner thread 22a is formed in the inner peripheral wall thereof in the circumferential direction. The internal thread 22a is configured to be screwed to the external thread 31a of the buffer ring 3 to be described later. Further, a slope 22b is provided on the inner peripheral wall of the rib 22 in the circumferential direction. The slope 22b is further forward than the internal thread 22a, and is configured to be screwed to the slope 31b of the buffer ring 3 to be described later. Further, a portion of the rib 22 in the circumferential direction is provided with a gas supply hole 22c penetrating the rib 22 in the extending direction of the axis O (hereinafter, referred to as an axial direction), the gas supply hole 22c due to the gun head The space on the 21 side communicates with the front end 23 of the gas flow path, so that the gas from the front end 23 of the gas flow path can be supplied to the gun head 21 side (see Fig. 4).

The nozzle connecting portion 24 is a cylindrical member connectable to the liquid nozzle 4 and is provided to penetrate the opening of the rib 22 . Further, since the nozzle connecting portion 24 is in contact with a liquid such as a paint, it is preferably made of a corrosion-resistant material such as stainless steel. The inner peripheral wall of the nozzle connecting portion 24 is provided with an internal thread 24a along the peripheral direction, and the internal thread 24a is configured to be screwable to the external thread 41a of the liquid nozzle 4 to be described later. Further, the inner peripheral wall of the nozzle connecting portion 24 is provided with a slope 24b (first slope) along the circumferential direction. The slope 24b is located further rearward than the internal thread 24a, and is configured to be able to be stuck with the slope 41b of the liquid nozzle 4 to be described later. Hehe.

As shown in Fig. 4, the gas branching groove 25 communicates the tip end 23 of the gas flow path with a gas branching channel to be described later, so that the gas from the tip end 23 of the gas channel can be supplied to the gas branching channel.

As shown in FIGS. 3 and 4, the buffer ring 3 includes a cylindrical base portion 31 that is detachable from the rib 22 by screwing, and a first outer diameter D1 that is larger than the outer diameter of the base portion 31. The annular flange portion 32 and the cylindrical projecting portion 33 projecting forward from the flange portion 32.

The base portion 31 has an external thread 31a for screwing with the internal thread 22a on the peripheral wall, whereby the base portion 31 can be detached from the rib portion 22 by the external thread 31a being screwed to the internal thread 22a of the gun body 2. Further, a slope 31b for engaging with the slope 22b of the gun body 2 is provided on the peripheral wall of the base portion 31 so as to be positioned forward of the external thread 31a.

The flange portion 32 is integrally formed with the base portion 31 at a position ahead of the base portion 31 and has a fourth inner diameter d4 larger than the inner diameter of the base portion 31. Further, in a state in which the base portion 31 is attached to the rib 22 of the gun body 2, as shown in Fig. 4, the space surrounded by the buffer ring 3, the gun head portion 21, and the rib portion 22 becomes the gas rectifying chamber 9, and A gap is formed between the peripheral wall of the edge portion 32 and the inner peripheral wall of the tip end side of the gun head portion 21 opposed thereto. As described above, the gas rectifying chamber 9 corresponding to the space on the side of the gun head 21 communicates with the tip end 23 of the gas flow path through the gas supply hole 22c. Thereby, the gas supplied from the front end 23 of the gas flow path is rectified through the gas rectifying chamber 9 through a gap formed between the peripheral wall of the flange portion 32 and the inner peripheral wall on the tip end side of the gun head portion 21.

The protruding portion 33 protrudes forward from the flange portion 32 integrally with the flange portion 32 and has a third inner diameter d3 that is larger than the fourth inner diameter d4 of the flange portion 32. Further, a gasket 5 that can abut against the inner peripheral wall of the protruding portion 33 is provided. Further, 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 adjacent to the protruding portion 33, thereby restricting the gasket 5 Move to the rear. That is, when the washer 5 moves rearward along the inner peripheral wall of the protruding portion 33, it abuts against the inner edge of the flange portion 32, thereby restricting the movement of the washer 5 rearward.

Moreover, as shown in FIG. 4, the protruding portion 33 protrudes forward from the front end of the gun head portion 21. Further, in this embodiment, the protruding portion 33 is constituted by a hexagonal portion (see FIG. 2). However, the protruding portion 33 is not limited thereto. For example, a pair of parallel planes may be formed on the peripheral wall. At this time, the buffer ring 3 may be formed. It suffices that the pair of parallel planes of the protruding portion 33 can be rotated while being held by a standard tool or the like.

As described above, the buffer ring 3 is easily detached from the gun body 2 in a state where the protruding portion 33 is held by a standard tool or the like, and the space of the gas rectifying chamber 9 blocked by the buffer ring 3 can be easily cleaned. .

The liquid nozzle 4 is attached to the nozzle coupling portion 24 through the opening of the base portion 31 as shown in FIGS. 2 to 4 . Further, the liquid nozzle 4 has a nozzle body 41 that can eject the liquid and can be attached to the nozzle coupling portion 24, a buffer plate 42 that is provided on the peripheral wall of the nozzle body 41 in the circumferential direction, and a front side of the buffer plate 42. The manner is provided in the diameter-enlarged portion 43 of the peripheral wall of the nozzle body 41 along the circumferential direction.

The nozzle body 41 extends in the axial direction and has an outer diameter smaller than the inner diameter of the base portion 31, and an outer thread 41a for screwing the internal thread 24a of the nozzle coupling portion 24 is provided on the outer peripheral wall of the rear end side. Thereby, the nozzle body 41 can be detached from the nozzle coupling portion 24 by the lock so as to penetrate the opening of the base portion 31. Further, a gas branching flow path that communicates with the front end 23 of the gas flow path is formed between the peripheral wall of the nozzle body 41 and the base portion 31 of the buffer ring 3 and the inner peripheral wall of the flange portion 32.

Further, a slope 41b (second slope) for engaging with the slope 24b of the nozzle coupling portion 24 is provided on the outer wall of the nozzle body 41 so as to be located further rearward than the external thread 41a. Therefore, in a state where the nozzle body 41 is locked and attached to the nozzle coupling portion 24, by the engagement of the slope 24b and the slope 41b, it is possible to surely prevent liquid leakage of paint or the like from the junction of the nozzle body 41 and the nozzle coupling portion 24. . Further, where the liquid nozzle 4 is engaged with the gun body 2, only the slope 24b of the nozzle coupling portion 24 is engaged with the slope 41b of the nozzle body 41.

The baffle plate 42 is formed on the rear side of the enlarged diameter portion 43 integrally formed with the nozzle body 41, 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 of the cushion ring 3. As shown in Fig. 4, in the gas branching flow path, a gap for gas rectification is formed between the peripheral wall of the baffle plate 42 and the inner peripheral wall of the base portion 31 opposed thereto. Thereby, the gas supplied from the front end 23 of the gas flow path is different from the gas supply hole 22c, flows into the gas branching flow path through the gas branching groove 25, and is formed in the peripheral wall of the baffle plate 42 and the inner peripheral wall of the base portion 31. The gap between them forms a rectification.

The enlarged diameter portion 43 includes a gasket arrangement portion 43a having a second outer diameter D2 that is smaller than the third inner diameter d3 of the protruding portion 33, and has a larger outer diameter than the second outer diameter D2 and smaller than the third inner diameter d3. The outer diameter D3 is located further on the front side than the washer arrangement portion 43a, and is provided with a movement restricting portion 43b adjacent to the washer arrangement portion 43a. The outer diameter D3 is larger than the third outer diameter D3, and is disposed more than the movement restricting portion 43b. The front side portion 43c on the front side and the plurality of through holes 43d penetrating the enlarged diameter portion 43 in the axial direction.

A gasket 5 is provided which can abut against the peripheral wall of the gasket arrangement portion 43a. Further, on the front side of the peripheral wall of the gasket arrangement portion 43a, a movement restricting portion 43b having a third outer diameter D3 larger than the second outer diameter D2 of the gasket arrangement portion 43a is formed adjacent to the gasket arrangement portion 43a. Thereby, the movement of the washer 5 to the front is restricted. In other words, when the gasket 5 moves forward along the peripheral wall of the gasket arrangement portion 43a, it comes into contact with the movement restricting portion 43b, thereby restricting the forward movement of the gasket 5.

A slope 43e engageable with an annular slope 63 of a gas cover 6 to be described later is provided on the front end side of the front side portion 43c.

The plurality of through holes 43d are for supplying a gas supplied through the gas branching flow path to an annular gap and an auxiliary gas formed between the atomizing gas ejection hole 61a and the outer diameter of the tip end of the liquid ejection port 4a side of the liquid nozzle 4. The discharge holes 61b are provided at predetermined intervals in the circumferential direction.

The annular gasket 5 is disposed between the inner peripheral wall of the protruding portion 33 of the buffer ring 3 and the peripheral wall of the gasket arrangement portion 43a of the liquid nozzle 4 opposed thereto as shown in Fig. 4 . Specifically, the gasket 5 is disposed such that the outer wall and the inner peripheral wall thereof abut against the inner peripheral wall of the protruding portion 33 and the outer peripheral wall of the gasket arrangement portion 43a, and are disposed in the protruding portion 33 along the circumferential direction. Between the gasket arrangement portion 43a. In other words, the enlarged diameter portion 43 of the liquid nozzle 4 is held by the buffer ring 3 through the gasket 5. Therefore, the gasket 5 can be easily detached from the inner peripheral wall of the protruding portion 33 without using a special tool.

Further, the washer 5 is sandwiched between the movement restricting portion 43b and the flange portion 32 so as not to abut 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 larger than the width t of the gasket 5 in the front-rear direction (axial direction). Therefore, the gasket 5 is pushed or deformed in the front-rear direction (axial direction) by the degree of locking of the external thread 41a of the nozzle body 41 and the internal thread 24a of the nozzle coupling portion 24, and the reliability as a sealing material can be improved.

In the embodiment, the washer 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 and not in contact with the flange portion 32 in the front-rear direction (axial direction). Between (see Figure 4).

Further, the gasket 5 has a groove 5a formed along the circumferential direction on a surface (rear end surface) opposed to the flange portion 32. Therefore, the inner peripheral wall of the gasket 5 is pushed to the peripheral wall of the gasket arrangement portion 43a by the gas supplied from the front end 23 of the gas flow path via the gas branch flow path into the groove 5a, and the peripheral wall of the gasket 5 is provided. The inner peripheral wall of the projection 33 is pressed, so that the sealing effect of the gasket 5 can be improved.

As described above, the liquid nozzle 4 uses the slope 41b at the junction with the nozzle coupling portion 24, and uses the gasket 5 at the junction with the protruding portion 33 of the buffer ring 3, and thus the connection with the nozzle joint portion 24 and the buffer Any one of the joints of the ring 3 uses a ramp comparison to improve the reliability of the sealing effect. In other words, in the liquid nozzle 4, when the slope is used in either the connection between the head connecting portion 24 and the connection to the buffer ring 3, even if the external thread 41a of the nozzle body 41 and the nozzle connecting portion 24 are used. The locking degree of the thread 24a can smoothly engage the slope of one place, and there is still a possibility that the slope of the other side cannot be smoothly engaged. In this embodiment, as described above, by the slope 41b In combination with the gasket 5, when the liquid nozzle 4 is fixed, the problem that the slope cannot be smoothly engaged can be eliminated.

Further, when a slope is used in any of the connection between the nozzle connection portion 24 and the connection to the buffer ring 3, when the two slopes are engaged, high manufacturing precision is required for each component, but In the present embodiment, since it is not necessary to engage the two slopes together, high-precision manufacturing is not required, and the components constituting the spray gun 1 can be easily manufactured.

As shown in FIGS. 2 and 3, the gas cap 6 includes a lid body 61, a pair of corner portions 62 provided in the lid body 61, and an annular slope 63 projecting rearward from the back surface of the lid body 61.

The lid main body 61 has an atomizing gas ejection hole 61a and a plurality of auxiliary gas ejection 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 gas that is supplied to the outside through a gap formed between a peripheral wall of the flange portion 32 of the cushion ring 3 and an inner peripheral wall of the tip end side of the gun head portion 2 of the gun body 2 The gas discharge hole 62a for the plural mode adjustment.

As described above, the annular slope 63 is engaged with the slope 43e of the enlarged diameter portion 43 of the liquid nozzle 4, as shown in Fig. 4, by the engagement of the slope 63 of the gas cover 6 with the slope 43e of the enlarged diameter portion 43 The gas supplied through the plurality of through holes 43d of the nozzle body 41 and the gas supplied through the gap formed between the peripheral wall of the flange portion 32 and the inner peripheral wall of the tip end side of the gun head portion 21 are not mixed. The annular gap formed between the atomizing gas ejection hole 61a and the outer diameter of the tip end of the liquid ejection opening 4a of the liquid nozzle 4, and the plurality of auxiliary gas ejection holes 61b and the plurality of mode adjustment gas ejection holes 62a can be surely provided. Spit out.

The cover 7 has an internal thread 71 for screwing with the external thread 21a of the gun body 2 provided on the inner peripheral wall of the rear end side thereof, and a washer arrangement groove 72 provided at the inner peripheral wall thereof with the internal thread 71 located further forward. And a cover washer 73 fitted to the gasket arrangement groove 72 to abut against the peripheral wall of the gun head 21.

The cover gasket 73 is disposed between the gasket arrangement groove 72 of the cover 7 and the peripheral wall of the gun head 21 as shown in Fig. 4, and thus has a function as a sealing material, and is formed on the outer peripheral wall of the flange portion 32. The gas supplied from the gap between the inner peripheral walls of the tip end side of the gun head 21 can be more reliably discharged from the plurality of mode adjustment gas discharge holes 62a.

(1) A spray gun according to one aspect includes a gun body and a buffer ring that can be detached from the gun body, and is characterized in that the gun body includes a cylindrical gun head and is disposed at the front end side and has the first inner portion. a cylindrical rib having a second inner diameter smaller than the first inner diameter, integrally formed with the gun head at a rear side of the gun head, and an internal thread on the inner peripheral wall; And a gas supply hole formed in a portion of the circumferential direction of the rib for supplying gas to the gun head side, wherein the buffer ring has a cylindrical base portion and is provided with a screw thread on the peripheral wall The external thread to be used is disengaged from the rib by the external thread and the internal thread; the annular flange portion is integrally formed on the base and has a first outer diameter larger than the outer diameter of the base The protrusion and the protruding portion are integrally formed with the flange portion and protrude forward from the front end of the gun head, and a gap is formed between the inner peripheral wall of the gun head and the peripheral wall of the flange portion. The buffer ring rotates while holding the above-mentioned protruding portion It may be off with respect to the forward gun body. According to this aspect, the cushion ring can be detached from the gun body by the state in which the protruding portion of the buffer ring is gripped, so that the space blocked by the buffer ring can be easily cleaned. Further, the supplied gas can be rectified by passing a gap formed between the peripheral wall of the flange portion and the inner peripheral wall of the tip end side of the gun body portion.

(2) In the above configuration (1), the gun body has a nozzle connecting portion that is disposed on the rear side of the gun head and penetrates the opening of the rib, and the spray gun further includes an opening penetrating the base portion The liquid nozzle attached to the nozzle coupling portion is locked, the protruding portion of the buffer ring has a third inner diameter larger than an inner diameter of the flange portion, and the flange portion has a smaller inner diameter than the third inner diameter In the inner diameter, the liquid nozzle includes a cylindrical nozzle body attached to the nozzle connecting portion, and a diameter-enlarged portion provided in a circumferential direction on a peripheral wall of the nozzle body, and the enlarged diameter portion. A gasket arrangement portion having a second outer diameter smaller than the third inner diameter and a third outer diameter larger than the second outer diameter are provided on the front side of the gasket arrangement portion and provided a movement restricting portion adjacent to the gasket arrangement portion, and a peripheral wall of the gasket arrangement portion and an inner peripheral wall of the protrusion portion are disposed between a peripheral wall of the gasket arrangement portion and an inner peripheral wall of the protrusion portion Abutting ring Washer, the washer is in the front-rear direction, so as not to abut against the movement limiting portion and said flange portion, wherein at least either one preferably clamped between the movement restricting portion and the flange portion. According to this aspect, the gasket is pressed or deformed in the front-rear direction (axial direction) without being locked by the nozzle coupling portion of the liquid nozzle and the gun body, and the reliability as the sealing material can be improved.

(3) In the above configuration (2), the nozzle connecting portion has a first slope, the nozzle body has a second slope for engaging with the first slope, and the liquid nozzle is engaged with the gun body only It is preferable that the first slope is engaged with the second slope. According to this aspect, the liquid nozzle uses a slope at the junction with the nozzle coupling portion, and a gasket is used at the junction with the protruding portion of the buffer ring, so that the slope is used at the junction with the nozzle coupling portion and the connection with the buffer ring. Comparison can improve the reliability of the sealing effect. In other words, in the liquid nozzle, when the slope is used in the connection between the nozzle coupling portion and the connection to the buffer ring, even if the slope of the nozzle body and the nozzle coupling portion are tightly engaged, the slope of one portion is smoothly engaged. There will still be another slope where the slope cannot be smoothly engaged. On the other hand, in the present embodiment, by using the combination of the slope and the washer, when the liquid nozzle is fixed, the problem that the slope cannot be smoothly engaged can be eliminated. Further, when a slope is used for the connection between the nozzle connection portion and the connection portion with the buffer ring, when the two slopes are engaged with each other, high manufacturing precision is required for each component, but in the present embodiment, There is no need to snap the two slopes together, so high-precision manufacturing is not required, and the components constituting the spray gun can be easily manufactured.

(4) In the configuration of any one of the above (1) to (3), the protruding portion is preferably formed by forming a pair of parallel planes on the peripheral wall. At this time, the buffer ring can be rotated in a state in which a pair of parallel planes of the protruding portion are held by a standard tool or the like, and can be easily detached from the gun body.

According to the above embodiment, it is possible to provide a lance that can be easily cleaned while maintaining the rectification of the gas by the flange portion corresponding to the baffle plate.

As described above, the present invention has been described with reference to the embodiments. However, the technical scope of the present invention is of course not limited to the scope of the invention described in the above embodiments, and various changes or improvements can be made to the above-described embodiments. Further, it is to be understood that the scope of the patent application can be clearly understood by the scope of the patent application.

The present application claims priority based on Japanese Application No. 2017-116779, filed on Jun. 14, 2017. The disclosure of Japanese Patent Application No. 2017-116779, filed on Jun.

All of the disclosures of the specification, the patent application, and the abstract of the Japanese Patent Application Laid-Open No. Hei 9-267060 (Patent Document 1) are hereby incorporated by reference.

1‧‧‧ spray gun

2‧‧‧ gun body

3‧‧‧buffer ring

4‧‧‧Liquid nozzle

4a‧‧‧liquid injection port

5‧‧‧Washers

5a‧‧‧ trench

6‧‧‧ gas cover

7‧‧‧ cover

8‧‧‧Gas adjustment needle

9‧‧‧ gas rectifier room

10‧‧‧needle valve

11‧‧‧ Trigger

12‧‧‧ needle spring

13‧‧‧ gas valve

14‧‧‧ gas supply port

15‧‧‧Mode gas adjustment knob

16‧‧‧Integral gas adjustment knob

17‧‧‧Liquid supply

21‧‧‧ gun head

21a‧‧‧ external thread

22‧‧‧ ribs

22a‧‧‧ internal thread

22b‧‧‧ slope

22c‧‧‧ gas supply hole

23‧‧‧ front end of gas flow path

24‧‧‧Nozzle joints

24a‧‧‧ internal thread

24b‧‧‧Ramp (1st slope)

25‧‧‧ gas branching trough

31‧‧‧ base

31a‧‧‧ external thread

31b‧‧‧ slope

32‧‧‧Front

33‧‧‧Protruding

41‧‧‧Nozzle body

41a‧‧‧ external thread

41b‧‧‧Ramp (2nd slope)

42‧‧‧Baffle board

43‧‧‧Expanding section

43a‧‧‧Gas fitting department

43b‧‧‧Mobile Restriction Department

43c‧‧‧ front side

43d‧‧‧through hole

43e‧‧‧ slope

61‧‧‧ gas cover body

61a‧‧‧Aeration gas injection hole

61b‧‧‧Assistant gas ejection hole

62‧‧‧ corner

62a‧‧‧Mode adjustment gas ejection hole

63‧‧‧ slope

71‧‧‧ internal thread

72‧‧‧Washer configuration slot

73‧‧‧Cover washers

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

‧‧‧Width

Fig. 1 is a schematic view showing the entirety of a spray gun according to a embodiment of the present invention. Fig. 2 is an exploded perspective view showing the main part of the lance according to the embodiment of the present invention. Fig. 3 is an exploded cross-sectional view showing the main part of the lance according to the embodiment of the present invention. Fig. 4 is a cross-sectional view showing the main part of a spray gun according to a relevant embodiment of the present invention.

Claims (4)

A spray gun comprising: a gun body; and a spray gun that is detachable from the buffer ring of the gun body, wherein: the gun body includes: a cylindrical gun head disposed on the front end side and having a first inner diameter; a rib having a second inner diameter smaller than the first inner diameter, integrally formed with the gun head at a rear side of the gun head, and an internal thread on the inner peripheral wall; and a gas supply a hole formed in a portion of the circumferential direction of the rib for supplying a gas to the gun head side, wherein the buffer ring includes: a cylindrical base portion, and the peripheral wall is provided with a screw for the internal thread a threaded portion by which the external thread and the internal thread are screwed off relative to the rib; an annular flange portion integrally formed on the base portion and having a first outer diameter larger than an outer diameter of the base portion; The protruding portion is integrally formed with the flange portion and protrudes forward from the front end of the gun head, and a gap is formed between the inner peripheral wall of the gun head and the peripheral wall of the flange portion. In a state where the cushion ring gripping the protruding portion, the rotation may be with respect to the main body off the gun. The lance according to the first aspect of the invention, wherein the lance is provided with a nozzle connecting portion that is disposed on the rear side of the lance portion and that extends through the rib portion, and the lance further includes a base penetrating the base portion. Opening and closing a liquid nozzle attached to the nozzle coupling portion, the protruding portion of the buffer ring has a third inner diameter larger than an inner diameter of the flange portion, and the flange portion has a smaller inner diameter than the third inner diameter The fourth inner diameter, the liquid nozzle includes a cylindrical nozzle body attached to the nozzle coupling portion, and a diameter-enlarged portion provided on a peripheral wall of the nozzle body in a circumferential direction, the diameter-expanding portion And a gasket arrangement portion having a second outer diameter smaller than the third inner diameter, and a third outer diameter larger than the second outer diameter, and provided on the front side of the gasket arrangement portion a movement restricting portion adjacent to the washer arrangement portion is disposed between a peripheral wall of the washer arrangement portion and an inner peripheral wall of the protruding portion An annular gasket having a peripheral wall of the gasket arrangement portion and an inner peripheral wall of the protruding portion, wherein the gasket is at least in contact with the movement restricting portion and the flange portion in the front-rear direction One of the two is sandwiched between the movement restricting portion and the flange portion. The spray gun according to the second aspect of the invention, wherein the nozzle connecting portion has a first slope, the nozzle body has a second slope for engaging with the first slope, and a position where the liquid nozzle engages with the gun body It is only the point where the first slope and the second slope are engaged. The lance according to any one of claims 1 to 3, wherein the protruding portion is formed with a pair of parallel flat surfaces on the peripheral wall.