TWM505978U - Improvement of turn-around sprayer gun - Google Patents

Description

Improvement of the cyclone gun

The present invention provides an improvement of a swirling spray gun, in particular, a spray gun on the side of the gas transmission sleeve for the rotary injection gas, which is assembled and assembled on the butt screw of the gas supply sleeve on the grip side of the spray gun. The nozzle reaches the purpose of rotating the high-pressure air sent into the gas transmission sleeve through the swirling nozzle.

According to the advancement of the technological era, people's quality in clothing, food, housing, transportation and entertainment has also been continuously improved. In terms of transportation, various vehicles such as steam and locomotives have become the means of transportation for people. It is also increasing with each day. Regarding the cleaning and finishing operations of various steam and locomotives, although electric washing machines are available for automatic cleaning of the car body, after all, the electric car washing machine only rolls and scrubs on the outside of the car body with a rolling brush body. The edge of the body or the concave and convex position cannot be fully cleaned. Therefore, many people will wash the car body by hand washing, and the car body can be cleaned completely. After cleaning the car body, use the dry cloth. Wiping the residual water stains on the car body is time consuming and labor intensive.

In the general cleaning work, the brush is washed with a water brush, cloth, etc., and the outside of the object is cleaned and washed. When cleaning in a vehicle or a building, a strong water column and brush are needed. Auxiliary cleaning operations such as cloth towels, and the use of water pipes to extend the water line, use the fingers to flatten the water pipes at the end of the water pipes, so that the water supply column is stronger. Squirting, can wash the appearance of the object, and then use the brush, cloth towel, etc. to clean and wash after flushing, not only time-consuming and labor-intensive, but also a lot of water is wasted, which is quite inconsistent with the requirements of water saving and energy saving. In order to improve the waste of water caused by traditional cleaning operations, the use of high-pressure air combined with water guns can strengthen the power of water column scouring and control the time of water consumption without causing the loss of a large number of water sources. Figure 7 is a side cross-sectional view of a conventional air pressure retracting spray gun. The spray gun A is composed of a grip A1, a T-tube A2, a liquid cylinder A3, and a spray pipe B, and is sprayed. The pipe member B includes a bell tube B1. The bell tube B1 is provided with a screw seat B11 at one end thereof, and is screwed to the pressure air outlet end A4 of the spray gun A. The outer end of the bell tube B1 is open, and the pressure air in the spray gun A is The thread at the center of the outlet end A4 is screwed to the joint C1 at one end of the return force tube C, and a weighting pipe C2 is disposed at an appropriate external position of the return force pipe C, and a water pipe C3 is extended in the return force pipe C to The T-tube A2 is further inserted into the liquid cylinder A3, and The other side of the water pipe C3 is provided with an injection port C31 at the suspension section of the return force pipe C. Then, the spray gun A is input to the outside high pressure air from the grip A1, and then transmitted to the pressure air outlet end A4 via the T-shaped pipe A2, and then enters the return force. Tube C, and the high-pressure air is taken out at the injection port C31 of the return force pipe C and the water tube C3 by the Venturi effect, and the water in the liquid cylinder A3 is taken out, and after the injection port C31 is mixed with the high-pressure air, that is, via the water pipe The injection port C31 of C3 is sprayed outward to perform the flushing operation through the air pressure returning gun A, but in actual implementation, the returning force tube C inside the spray gun A is driven by the high pressure air to rapidly rotate inside the bell tube B1, resulting in rapid rotation of the inside of the bell tube B1. The returning force tube C and the weighting tube C2 and the bell tube B1 are worn out due to friction, and after long-term use, the joint position of the joint C1 and the outlet end A4 of the returning force tube C is easily broken. When the spray gun A is actually applied, the returning force tube is formed. C breaks and is pulled out of the outside of the bell tube B1 by the high-pressure air spray force, so that the use of the spray gun A is liable to cause an accident or the like.

Therefore, how to solve the current high-pressure air spray gun application, it is easy to cause the lack of wear and tear of the pull-back pipe and the weighting pipe on the inner wall surface of the flare pipe, and it is easy to cause trouble and trouble of the breakage of the spray gun when the return pipe is used, that is, For those in this industry who want to improve their direction.

Therefore, in view of the above-mentioned problems and deficiencies, the creators have collected relevant information, evaluated and considered them through multiple parties, and through years of experience in the industry, through continuous trial and modification, they have designed such a spray gun. A swirling nozzle is connected to one side of the gas transmission sleeve, and the gas is swirled outwardly through the swirling nozzle, thereby improving the wear of the returning force tube and the weighting tube on the inner wall surface of the flared tube, and the risk of the parts flying outward is not easy to occur. The birth of a new patent for the improvement of the cyclone spray gun.

The main purpose of this creation is that the spray gun is provided with an air inlet at the bottom of the grip, a valve seat is arranged in front to control the air inlet to deliver high-pressure air, and a gas transmission sleeve is connected to one side of the valve seat. The butt screw on one side of the gas transmission sleeve can be assembled by the mating screw hole of the connecting nut of the rotary nozzle, and the connecting nut has a perforation, and the outer side is provided with an external thread for the inner screw hole of the outer cover to be locked, and A bearing groove having a through hole is arranged in the outer cover for assembling the bearing, and the rotating body is sleeved in the inner rotating hole of the bearing, and the retaining flange protruding from the connecting position of the rotating body and the retaining ring is resisted. On the side of the bearing, the perforation of the aligning nut of the plenum inside the plenum and the oblique injection hole on the other side of the plenum are provided for the gas to pass through the gas venting sleeve and the swirling nozzle to achieve the oblique direction of the rotating body. The purpose of injecting gas outward into the orifice.

The secondary purpose of this creation is that the bottom of the gas transmission casing of the spray gun can be connected with a water storage tank for storing liquid (such as water, cleaning liquid, soap water or water wax, etc.), and the water storage tank. The liquid can be pumped to the connecting pipe through the water supply pipe, and a water pipe is arranged in the connecting pipe to transfer the liquid drawn by the water supply pipe outward, and the water pipe is extended from the connecting pipe into the gas pipe casing. a gas vent, a perforation of the connecting nut, and a plenum of the rotating body of the rotary nozzle, and a through hole is provided on the side of the plenum of the rotating body toward the outer end surface for the end of the water supply pipe side to be provided, and The through hole is located at the side of the oblique injection hole of the rotary body, and the high pressure air is sent into the gas transmission sleeve through the boring machine at the valve seat of the spray gun, so that the rotary body of the rotary nozzle is rotated. The oblique spray hole is sprayed outward, and the high-pressure air can also be sprayed outwardly from the gap formed between the through hole of the rotary body and the end of the water pipe, so as to simultaneously spray gas and atomize water gas. The atomized water gas is sprayed again through the oblique spray hole located at the side of the through hole, so that the atomized water gas can form a finer water mist effect.

1‧‧‧ grip

11‧‧‧air inlet

111‧‧‧ gas supply pipe

12‧‧‧ valve seat

121‧‧‧ outlet

13‧‧‧钣机

2‧‧‧Gas casing

20‧‧‧ Vents

21‧‧‧Connecting section

22‧‧‧Docking screw

221‧‧‧shims

23‧‧‧Connecting tube

231‧‧ ‧ water bucket

232‧‧‧Water supply pipe

233‧‧‧Water pipes

2331‧‧‧End

3‧‧‧Rotary nozzle

31‧‧‧Link nuts

310‧‧‧Perforation

311‧‧‧Docking screw holes

312‧‧‧ external thread

32‧‧‧ coat cover

320‧‧‧ accommodating slots

321‧‧‧Inner hole

322‧‧‧through hole

33‧‧‧Revolving body

330‧‧‧gas collection room

331‧‧‧ oblique orifice

332‧‧‧stop ring

333‧‧‧stop flange

334‧‧‧Outer end face

335‧‧‧through hole

34‧‧‧ bearing

340‧‧‧Internal hole

A‧‧‧ spray gun

A1‧‧‧ grip

A2‧‧‧T-tube

A3‧‧‧Liquid tube

A4‧‧‧export end

B‧‧‧spray fittings

B1‧‧‧ flare tube

B11‧‧‧ screw seat

C‧‧‧Return tube

C1‧‧‧ joint

C2‧‧‧weighted tube

C3‧‧‧汲Water pipes

C31‧‧‧jet

The first picture is a three-dimensional appearance of the creation.

The second picture is a three-dimensional exploded view of the creation.

The third figure is a side profile view of the creation.

The fourth picture is an enlarged view of the third part of the third part of the creation.

Figure 5 is a side elevational cross-sectional view of the preferred embodiment of the present invention.

The sixth picture is an enlarged view of part B of the fifth part of the creation.

Figure 7 is a side cross-sectional view of a conventional air pressure returning spray gun.

In order to achieve the above objectives and effects, the technical means used in the creation, its construction, the method of implementation, etc., are described in detail in the preferred embodiment of the creation. As follows, Philip fully understands.

Please refer to the first, second, third and fourth figures, which are respectively the three-dimensional appearance, the three-dimensional exploded view, the side partial cross-sectional view of the creation, and the enlarged view of the third part of the third figure, which is clear from the figure. It can be seen that the swirling spray gun of the present invention includes a grip 1, a gas delivery sleeve 2 and a swirling spray head 3, wherein:

The grip 1 is provided with an air inlet 11 on the bottom side, a valve seat 12 on the upper side for the operation of the rake 13, and a high pressure air for introducing the external air inlet 11 to be sent out from the other side of the valve seat 12 High pressure air.

The gas transmission sleeve 2 has a gas transmission hole 20 therein, and has an engagement portion 21 on one side and a butt screw 22 on the other side.

The swinging sprinkler 3 includes a connecting nut 31, a cover 32 that is locked to the side of the connecting nut 31, a rotating body 33 of the movable device inside the outer cover 32, and a bearing 34, and the connecting nut 31 has a through hole therein. The through hole 310 is disposed on the side of the through hole 310, and the external thread 312 is disposed on the outer side of the through hole 310. The external thread 312 of the connecting nut 31 is used to accommodate the inner groove 32 of the outer cover 32. The screw hole 321 is locked in one side, and the through hole 322 is formed on the other side of the receiving groove 320 of the outer cover 32, so that the rotating body 33 can be assembled in the receiving groove 320 of the outer cover 32, and A bearing 34 is sleeved on the outside of the rotating body 33, and a plenum 330 is recessed inside the rotating body 33, and the plenum 330 is provided with an inclined oblique opening 331 toward one side and a convex outer side at the other side. The retaining ring 332 has a retaining flange 333 protruding from the outer end of the retaining ring 332 and the rotating body 33. The bearing 34 that is externally sleeved by the rotating body 33 is abutted against the retaining flange 333. Wherein, there is a rotatable inner rotating hole 340 inside the bearing 34, and The outer ring of the bearing 34 is positioned inside the accommodating groove 320 of the outer cover 32, and the rotating body 33 is assisted to rotate by the inner rotating hole 340 of the bearing 34, and the outer end surface 334 of the outer side of the oblique spraying hole 331 of the rotating body 33 is It is placed in the through hole 322 of the jacket cover 32.

When assembling the above components, the bottom air inlet 11 of the grip 1 can be connected to an external high-pressure air supply source (such as a high-pressure air compressor, etc.), and the air outlet 121 of the valve seat 12 of the grip 1 can be supplied to the air supply sleeve. The connecting portion 21 on the side of the tube 2 is relatively assembled and joined, and the connecting screw 22 on the other side of the gas transmission sleeve 2, that is, the connecting nut 31 for the rotating nozzle 3 is locked by the mating screw hole 311, and is sleeved on the butting screw 22 A spacer 221 is disposed, and the connecting nut 31 is tightly engaged with the butt screw 22, and the through hole 310 connecting the nut 31 and the plenum 330 of the rotating body 33 are located at the air inlet 20 of the gas transmission sleeve 2, The high-pressure air supplied from the air inlet 11 to the grip 1 is introduced into the air supply port 20 from the air outlet 121 of the valve seat 12, and then sent to the air collection chamber 330 of the rotary body 33 to drive the rotary body 33 at the bearing 34. The purpose of the inner rotation hole 340 is to rotate, and the composition of the grip 1, the gas sleeve 2 and the swirling nozzle 3 can be used to form the swirling spray gun of the present invention.

In the actual application, the above-mentioned rotary gun is provided by an external high-pressure air supply source (through a high-pressure air compressor, etc.) which is controlled by the blower 13 of the gripper 13 at the valve seat 12 of the grip 1. The high-pressure air is supplied to the air venting hole 20 of the gas transmission casing 2 and then sent to the swirling nozzle 3, and the high-pressure air is sent to the plenum 330 of the rotating body 33 via the through hole 310 of the connecting nut 31. When the high-pressure air is injected outward toward the oblique injection hole 331 on the side of the plenum 330, the rotary body 33 is also driven to rotate in the inner rotation hole 340 of the bearing 34 in the accommodating groove 320 of the outer cover 32. And the side of the rotating body 33 is supported by the stop flange 333 on the outer side surface of the bearing 34 and the retaining ring side 3 on one side. 32 is spaced apart from the outer side surface of the connecting nut 31, so that the rotating body 33 can be rotated in the inner rotating hole 340 of the bearing 34 without being disturbed or hindered, and the outer end surface 334 of the rotating body 33 can also be covered by the outer cover. The through hole 322 of the 32 is rotatably moved, and high pressure air is sprayed outward through the oblique injection hole 331 of the rotary body 33 toward the through hole 322 of the outer cover 32 to form a swirling gas injection mode.

Please refer to the second, fifth and sixth figures, which are respectively an exploded perspective view of the creation, a side partial sectional view of the preferred embodiment, and an enlarged view of the fifth part B, which can be clearly seen from the figure. The swirling spray gun of the present invention can also be used as an application mode for spraying water mist. When the preferred embodiment is applied in practice, the gas supply sleeve 2 assembled on the side of the grip 1 can be used in the gas transmission sleeve 2 A connecting pipe 23 is disposed in the vertical direction of the bottom portion, so that the gas transmission casing 2 has a T-shaped three-way tubular shape, and a water storage tank 231 is connected to the bottom of the connecting pipe 23, and a water supply pipe 232 is disposed inside the connecting pipe 23 to extend into the water storage tank. In the 231, a water supply pipe 233 is further connected to the side of the connecting pipe 23, and the water supply pipe 233 extends into the gas transmission hole 20 of the gas transmission casing 2, the perforation 310 of the coupling nut 31 of the swirling nozzle 3, and the rotary body 33. The gas collecting chamber 330 is disposed, and the end portion 2331 of the water supply pipe 233 is disposed in the through hole 335 provided in the side of the gas collecting chamber 330 of the rotating body 33, and the diameter of the through hole 335 is larger than the end portion 2331. The diameter can form a proper gap between the through hole 335 and the end portion 2331 of the water pipe 233; that is, the bottom air inlet 11 of the grip 1 can be connected high. The air supply pipe 111 and the high-pressure air supply pipe 111 are connected to an external preset high-pressure air compressor, and are located at the gripper 13 of the grip 1 through the trigger to control the valve seat 12 to control the air sent by the air inlet 11 The air outlet 121 is sent out, and the high-pressure air is introduced into the air supply hole 20 of the gas transmission sleeve 2, and then sent to the perforation 310 of the coupling nut 31 of the swirling nozzle 3 and the gas collection chamber 330 of the rotary body 33 for high pressure. Gas passing through the oblique orifice The 331 is sprayed outward to drive the rotary body 33 to rotate in the inner rotation hole 340 of the bearing 34, and when the high pressure air enters the air supply hole 20 of the gas transmission sleeve 2, the air supply hole of the gas transmission sleeve 2 can be The Venturi effect is generated at the through hole 335 of the outer rotating body 33, and the liquid water flowing in the water storage tank 231 can be guided upward and dripped through the water supply pipe 232 connected to the bottom of the connecting pipe 23 to supply the liquid through the water supply. The tube 232 is guided to the water pipe 233 at the top of the connecting pipe 23, and the end portion 2331 of the water transmitting pipe 233 passes through the through hole 335 of the rotating body 33, so that the liquid is sprayed outward through the end portion 2331, and high-pressure air enters. In the plenum 330 of the slewing body 33, in addition to being sprayed outwardly from the oblique injection hole 331, the high-pressure air may be sprayed outwardly from the gap formed between the through hole 335 and the end portion 2331, and the end portion 2311 may be sprayed outward. The liquid is atomized.

The rake machine 13 at the valve seat 12 of the spray gun controls the air inlet 11 to feed high-pressure air, so that the high-pressure air enters the gas transmission casing 2, and the oblique injection hole 331 of the rotary body 33 of the rotary nozzle 3 is outwardly outward. When the air is injected, the high-pressure air can be sprayed outwardly from the gap formed between the through hole 335 of the rotating body 33 and the end portion 2331 of the water pipe 233, so as to simultaneously spray the gas and atomize the water gas. The oblique spray hole 331 on the side of the through hole 335 is sprayed again on the atomized water gas to form a finer water mist effect by the atomized water gas. Further, the outer side thread 312 of the joint nut 31 and the outer cover 32 are connected. The inner screw hole 321 is a threaded locking joint, and the thread locking direction of the connecting nut 31 and the outer cover 32 of the swirling nozzle 3 is opposite to the inner rotating direction of the rotating body 33 in the receiving groove 320. The nozzle 3 is not easy to be sprayed out from the gas transmission sleeve 2, and the safety of the spray gun can be improved, there is no danger of falling off parts, and the danger degree of the spray gun application is reduced.

Therefore, the above description is only a preferred embodiment of the present creation, and is not a Limiting the patent scope of the creation, the spray gun of the present invention is assembled with the gas transfer sleeve 2 on the grip 1 side, and the joint nut 31 of the swirling spray head 3 is locked to the gas sleeve by the mating screw hole 311. The butt screw 22 of the tube 2 is assembled, and the outer cover cap 32 is assembled on the other side of the connecting nut 31, and a bearing 34 and a rotating body 33 movable at the inner rotating hole 340 of the bearing 34 are mounted in the outer cover 32, that is, The bottom of the grip 1 guides the external high-pressure air through the air inlet 11 and is controlled to open by the rake 13 of the valve seat 12, so that the high-pressure air enters the rotary body 33 of the rotary nozzle 3 through the air supply hole 20 of the gas transmission sleeve 2, The crucible can be circulated through the oblique injection hole 331 of the rotary body 33, and a connecting pipe 23 can be arranged at the bottom of the gas transmission casing 2 and a water storage tank 231 can be connected for the gas transmission casing. When the gas delivery hole 20 of the second embodiment supplies the high-pressure gas to the swirling nozzle 3, the gas pipe and the liquid pipe 233 are connected to the end portion 2331 of the connecting pipe 23, and the gas and the liquid are sprayed outward from the through hole 335 of the rotating body 33, and are formed. To refine the effect of water mist, the structure and device that can achieve the above effects should be covered by this creation. Decorative structural changes and equivalents shall be included within the same token the creation of the scope of the patent, together to Chen.

Therefore, this design is mainly for the design of the rotary spray gun, which is to assemble the rotary nozzle by using the gas delivery sleeve on one side of the grip, and lock the outer cover on the side of the connecting nut of the rotary nozzle, and the inner receiving groove of the outer cover The bearing and the rotating body are assembled, so that the grip is input with high-pressure air from the air inlet of the valve at the valve seat, so that the high-pressure air is sent to the rotary nozzle through the gas transmission sleeve, and the rotary body of the rotary nozzle can be reached. The oblique injection hole outwardly swirls the gas as the main protection point, and uses the gas casing to lock the rotary nozzle to shorten the path of high-pressure air transportation, which not only enhances the strength of the gas injected by the spray gun, but also allows the gas to be transported. The bottom of the casing is provided with a connecting pipe and a water storage tank, so that the liquid in the water storage tank can be simultaneously transported to the rotating body of the rotary nozzle through the gas transmission hole of the gas transmission casing, so that the gas and the water mist can be simultaneously sprayed, and The mist for spraying is more detailed, but The above description is only for the preferred embodiment of the present invention, and thus does not limit the scope of the patent of the present invention. Therefore, all the simple modifications and equivalent structural changes that are made by using the present specification and the contents of the drawings should be included in the same reason. Within the scope of the patent of this creation, it is given to Chen Ming.

In summary, the improvement of the above-mentioned gyro spray gun in the above-mentioned creation is actually achieved in terms of its efficacy and purpose when it is actually implemented and implemented. Therefore, this creation is a practical and excellent research and development, and is in conformity with the application requirements of the new patent.提出 Submit an application in accordance with the law, and hope that the trial committee will grant the case as soon as possible to protect the creators' hard work in research and development and creation. If there is any doubt in the ruling committee, please do not hesitate to give instructions, the creators will try their best to cooperate and feel good.

1‧‧‧ grip

11‧‧‧air inlet

12‧‧‧ valve seat

13‧‧‧钣机

2‧‧‧Gas casing

20‧‧‧ Vents

21‧‧‧Connecting section

22‧‧‧Docking screw

221‧‧‧shims

3‧‧‧Rotary nozzle

31‧‧‧Link nuts

310‧‧‧Perforation

311‧‧‧Docking screw holes

312‧‧‧ external thread

32‧‧‧ coat cover

320‧‧‧ accommodating slots

321‧‧‧Inner hole

322‧‧‧through hole

33‧‧‧Revolving body

330‧‧‧gas collection room

331‧‧‧ oblique orifice

332‧‧‧stop ring

333‧‧‧stop flange

334‧‧‧Outer end face

34‧‧‧ bearing

340‧‧‧Internal hole

Claims (8)

The invention relates to an improvement of a cyclone gun, which comprises a spray gun, a gas transmission sleeve and a swirling nozzle. The spray gun is provided at the bottom of the grip with an air inlet for connecting external high-pressure air, and the front of the grip is controlled by a rake machine. A valve seat for conveying high-pressure air, and a gas transmission sleeve is connected to one side of the valve seat, and the improvement is that the gas transmission sleeve is provided with a joint nut assembly for the rotary nozzle on the other side of the valve seat. a screw, the connecting nut of the rotating nozzle has a through hole penetrating therein, and one side is provided with a mating screw hole that is locked at the butt screw, and the other side is provided with an external screw hole for the outer cover of the outer cover. And a through hole for assembling the bearing is arranged inside the outer cover, and a through hole for outwardly passing through the side of the receiving groove is arranged, and the inner rotating hole of the bearing is sleeved with gas driven by the gas transmission sleeve. And a rotating rotating body, and a gas collecting chamber having a perforation of the counter connecting nut is arranged inside the rotating body, and then the gas collecting chamber is provided on the other side of the rotating body for gas to be sprayed toward the through hole of the outer cover. Oblique orifice. The improvement of the cyclone gun according to the first aspect of the patent application, wherein the outer side of the rotary body is convexly provided with a stop ring edge of a larger outer diameter, and is convexly disposed at a position where the rotary body and the stop ring are engaged. Retains the stop flange on the bearing surface. The improvement of the cyclone gun according to the first aspect of the patent application, wherein the connecting nut of the rotary nozzle is provided with a gasket disposed outside the butting screw of the gas transmission sleeve outside the butting screw hole, and the connecting nut is provided The inner perforation is opposite to the gas transmission hole inside the gas transmission sleeve. The improvement of the rotary lance as described in claim 1 , wherein the cover of the rotary nozzle is provided with a accommodating groove for assembling and positioning the bearing in a tight fit manner, and the bearing is internally provided for the rotary body to be assembled and assembled. Rotating hole inside the active rotation, and for the revolving body and the stop ring The contact position is provided with a stop flange that abuts against the outer side of the bearing. The improvement of the rotary lance according to the first aspect of the patent application, wherein the slewing system of the rotary nozzle has an oblique injection hole which is inclined outwardly toward the one side of the inner plenum. For example, in the improvement of the rotary lance as described in claim 1, wherein the bottom of the gas transmission sleeve is provided with a connecting pipe for the gas transmission sleeve to have a T-shaped three-way tubular shape, and a liquid storage medium is connected at the bottom of the connecting tube. a water storage tank, wherein the water storage tank is provided with a water supply pipe for drawing liquid to the connection pipe, and a water supply pipe for conveying the liquid extracted by the water supply pipe is disposed in the connection pipe, and the water supply pipe extends from the connection pipe a gas transmission hole of the gas transmission sleeve, a perforation of the joint nut, and a gas collection chamber of the rotary body, and a through hole for the end of the water supply pipe side is provided on the side of the gas collection chamber of the rotary body, and is provided for The through hole is located at the side of the oblique injection hole of the rotary body. The improvement of the cyclone gun according to Item 6 of the patent application, wherein the inner plenum of the rotary body is provided with a through hole penetrating to the outside toward the center of the side surface, and is provided with an outward oblique inclination on the side of the through hole. To the orifice. The improvement of the cyclone gun according to the sixth aspect of the patent application, wherein the inner gas collecting chamber of the rotating body is provided with a through hole penetrating to the outer portion at a central position of one outer end surface, and the diameter of the through hole is larger than the side end of the water pipe The outer diameter of the portion forms a gap for the passage of gas at the through hole outside the end portion of the water pipe.