Automatic enamel spraying gun head for small-caliber water heater inner container and spraying gun thereof

Abstract

The automatic enamel spraying gun head of the small-caliber water heater inner container comprises a spraying gun head body, a first spraying hole, a second spraying hole and a third spraying hole, and the first spraying hole, the second spraying hole and the third spraying hole are formed in the spraying gun head body and used for spraying coating. The first atomizing hole, the second atomizing hole and the third atomizing hole are used for being matched with the first spraying hole, the second spraying hole and the third spraying hole correspondingly to atomize the coating, and the first spraying hole, the second spraying hole and the third spraying hole are distributed in the axial direction of the spray gun head body in a three-dimensional staggered mode in the upper, middle and lower directions. The first spraying holes located in the upper portion spray towards the inclined upper portion of one side, the third spraying holes located in the lower portion spray towards the inclined lower portion, and the second spraying holes located in the middle spray towards the horizontal direction. According to the utility model, the problem of mutual interference of spray airflow of adjacent spray holes is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to small mouth hot -water heater inner container enamel technology field especially a small -bore hot -water heater inner container automatic spray enamel spray gun head and its spray gun. BACKGROUND

[0002] The hot -water heater inner container generally includes top cover, the body and the lower cover three parts welding, and the inner wall of hot -water inner container needs to be sprayed, and often needs to be combined to realize with multiple spray guns, generally 3 spray guns are inserted into the inner container at the same time, wherein 1 spray gun sprays the inner wall of the top cover of the inner container, 1 spray gun sprays the inner wall of the body of the inner container, and 1 spray gun sprays the lower cover of the inner container.But this combination mode is only suitable for the inner wall spraying operation of the hot -water heater inner container with flange mouth diameter greater than or equal to φ85mm.For the flange mouth diameter of small -bore hot -water heater inner container, the inner container with flange mouth diameter less than or equal to φ55mm, if 3 spray guns are combined, the volume is too large, and cannot be inserted into the inner container.

[0003] In order to solve the above problems, the patent document CN 116921093 A discloses a spray gun head and a spray gun for spraying the inner surface of a small -bore container, wherein the spray gun head comprises a spray gun head body, a first channel is provided inside the spray gun head body along the axial direction of the spray gun head body, a second channel is provided outside the first channel, a first spray hole, a second spray hole and a third spray hole are provided on the spray gun head body, a first atomizing hole is provided on both sides of the first spray hole, the two first atomizing holes are connected by the second channel, a second atomizing hole is provided on both sides of the second spray hole, the two second atomizing holes are connected by the second channel, a third atomizing hole is provided on both sides of the third spray hole, and the two third atomizing holes are connected by the second channel. Therefore, the spray gun head and the spray gun have the advantages of replacing three spray guns with one spray gun, lower use cost, wider spraying range, better spraying effect and greatly improved spraying efficiency.

[0004] However, when using this spray gun head, there are two problems: first, the airflow of the adjacent spray holes interferes with each other; second, the amount of returned material is large, which causes flow marks on the inner wall of the lower part of the body and the lower cover. INVENTION CONTENTS

[0005] The utility model provides a kind of small -bore hot -water heater inner container automatic spray enamel spray gun head and its spray gun without the airflow of the adjacent spray holes interfering with each other.

[0006] Another object of the utility model is that the amount of returned material is small, and no flow marks are caused on the inner wall of the lower part of the body and the lower cover.

[0007] The utility model discloses a hot water heater inner container automatic spray chambard gun head, including the spray gun head body, and set up on the spray gun head body for spraying the first spray hole, second spray hole and third spray hole of paint, the first atomizing hole, second atomizing hole and third atomizing hole for respectively with the first spray hole, second spray hole and third spray hole cooperation make paint atomization, the first spray hole, second spray hole and third spray hole in the axial direction of spray gun head body, the upper middle and lower three -dimensional staggered arrangement, wherein, the first spray hole of upper part is toward one side's oblique upper spray, the third spray hole of lower part is toward oblique lower spray, the second spray hole of middle part is toward horizontal direction spray.

[0008] As the improvement of the utility model, the first spray hole is controlled by the first feed pipe, and the first atomizing hole is controlled by the first air inlet pipe; the second spray hole is controlled by the second feed pipe, and the second atomizing hole is controlled by the second air inlet pipe; the third spray hole is controlled by the third feed pipe, and the third atomizing hole is controlled by the third air inlet pipe.

[0009] As the improvement of the utility model, the first spray hole, the second spray hole and the third spray hole are controlled by the first feed pipe, and the first atomizing hole is controlled by the first air inlet pipe; the second spray hole is controlled by the second feed pipe, and the second atomizing hole is controlled by the second air inlet pipe; the third spray hole is controlled by the third feed pipe, and the third atomizing hole is controlled by the third air inlet pipe.

[0010] As the improvement of the utility model, the first spray hole, the second spray hole and the third spray hole are controlled by the first feed pipe, and the first atomizing hole is controlled by the first air inlet pipe; the second spray hole is controlled by the second feed pipe, and the second atomizing hole is controlled by the second air inlet pipe; the third spray hole is controlled by the third feed pipe, and the third atomizing hole is controlled by the third air inlet pipe.

[0011] As the improvement of the utility model, the first spray hole, the second spray hole and the third spray hole are controlled by the first feed pipe, and the first atomizing hole is controlled by the first air inlet pipe; the second spray hole is controlled by the second feed pipe, and the second atomizing hole is controlled by the second air inlet pipe; the third spray hole is controlled by the third feed pipe, and the third atomizing hole is controlled by the third air inlet pipe.

[0012] As the improvement of the utility model, the first spray hole, the second spray hole and the third spray hole are controlled by the first feed pipe, and the first atomizing hole is controlled by the first air inlet pipe; the second spray hole is controlled by the second feed pipe, and the second atomizing hole is controlled by the second air inlet pipe; the third spray hole is controlled by the third feed pipe, and the third atomizing hole is controlled by the third air inlet pipe.

[0013] As improvement of the utility model, the second atomization hole includes a second atomization ring slit and a pair of second air jet tables arranged oppositely on both sides of the second jet hole and higher than the plane where the second jet hole is located, the second atomization ring slit is concentric with the second jet hole and is arranged on the immediate periphery of the second jet hole, and the airflow of the second atomization ring slit is used to blow the paint sprayed out of the second jet hole into mist; the opposite faces of the pair of second air jet tables are downward second inclined surfaces, at least one second air jet hole is arranged on each second inclined surface, and the gas sprayed out of the second air jet hole further atomizes the paint sprayed out of the second jet hole in an inclined direction.

[0014] As improvement of the utility model, the third atomization hole includes a third atomization ring slit and a pair of third air jet tables arranged oppositely on both sides of the third jet hole and higher than the plane where the third jet hole is located, the third atomization ring slit is concentric with the third jet hole and is arranged on the immediate periphery of the third jet hole, and the airflow of the third atomization ring slit is used to blow the paint sprayed out of the third jet hole into mist; the opposite faces of the pair of third air jet tables are downward third inclined surfaces, at least one third air jet hole is arranged on each third inclined surface, and the gas sprayed out of the third air jet hole further atomizes the paint sprayed out of the third jet hole in an inclined direction.

[0015] The utility model also provides a spray gun, including spray gun extension pole and hot water tank automatic spray cast spray gun head, the hot water tank automatic spray cast spray gun head is above-mentioned hot water tank automatic spray cast spray gun head.

[0016] As improvement of the utility model, three material conveying pipes and three gas conveying pipes are arranged in the spray gun extension pole, one end of the three material conveying pipes is connected with the first material inlet pipe, the second material inlet pipe and the third material inlet pipe one by one in correspondence respectively; one end of the three gas conveying pipes is connected with the first gas inlet pipe, the second gas inlet pipe and the third gas inlet pipe one by one in correspondence respectively; the other end of the three material conveying pipes is connected with three pressure-controllable pressure barrels respectively; the other end of the three gas conveying pipes is connected with three pressure-controllable compressed air sources respectively or is connected with a compressed air source through three pressure reducing valves.

[0017] The utility model discloses a first spray hole, second spray hole and third spray hole are arranged in the axial direction of the spray gun head body, and the first spray hole is arranged on the upper part and sprays obliquely upwards, the third spray hole is arranged on the lower part and sprays obliquely downwards, and the second spray hole is arranged on the middle part and sprays horizontally to the opposite side of the first spray hole, so that the first spray hole, second spray hole and third spray hole are staggered in three dimensions, and the first spray hole and the third spray hole are arranged on the upper part and the lower part respectively and are far apart from each other, so that the airflow interference problem is solved.

[0018] The utility model discloses a first spray hole by first feed pipe single controllable feed, first atomizing hole by first air pipe single controllable gas supply, second spray hole by second feed pipe single controllable feed, second atomizing hole by second air pipe single controllable gas supply, third spray hole by third feed pipe single controllable feed, third atomizing hole by third air pipe single controllable gas supply, so that the individual spraying according to the need, if the inner wall of the top cover is sprayed, only the first spray hole and the first atomizing hole can be used, and the second spray hole and the second atomizing hole and the third spray hole and the third atomizing hole are all stopped using, so that the excess coating is not sprayed from the second spray hole and the third spray hole, and the problem of the large amount of back material and the trace of the running glaze on the inner wall of the lower cover is solved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the plane structure schematic diagram of one embodiment of the utility model spray gun head.

[0020] Figure 2 It is Figure 1 The schematic diagram of the three-dimensional structure of the embodiment shown.

[0021] Figure 3 It is Figure 2 The schematic diagram of the three-dimensional structure of another view.

[0022] Figure 4is Figure 2 Another perspective view of the schematic diagram of the three-dimensional structure.

[0023] Figure 5 is Figure 1 The schematic diagram of the structure of air intake and feed of the embodiment shown.

[0024] Figure 6 The schematic diagram of the embodiment of the three spray holes of the utility model is shown.

[0025] Figure 7 The schematic diagram of the plane structure of the embodiment of the spray gun of the utility model is shown.

[0026] Figure 8 is Figure 7 The schematic diagram of the cross-sectional structure of H-H.

[0027] Figure 9 is Figure 8 The schematic diagram of the enlarged structure at I in the embodiment. DETAILED DESCRIPTION

[0028] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in combination with the drawings of the specification and the specific embodiments.

[0029] As Figures 1 to 5 shown, Figures 1 to 5 Disclosed is an automatic spraying gun head for a water heater liner, which is suitable for use in a small-caliber water heater liner with an inlet diameter greater than or equal to 38 mm and less than or equal to 55 mm, and comprises a spray gun head body 1, a first spray hole 11, a second spray hole 12 (see Figure 3 ) and a third spray hole 13 (see Figure 2 ) arranged on the spray gun head body 1 and used for spraying paint, a first atomizing hole 111, a second atomizing hole 121 and a third atomizing hole 131 used for cooperating with the first spray hole 11, the second spray hole 12 and the third spray hole 13 respectively to atomize the paint, and the first spray hole 11, the second spray hole 12 and the third spray hole 13 are arranged in an upper-middle-lower three-dimensional staggered manner in the axial direction of the spray gun head body 1, wherein the first spray hole 11 located at the upper part sprays obliquely upward toward one side, the third spray hole 13 located at the lower part sprays obliquely downward, and the second spray hole 12 located at the middle part sprays horizontally.

[0030] The utility model discloses a first atomizing hole 111 includes first atomizing ring slit 1111 and a pair of higher first jet orifice 11 both sides of the relative setting first jet orifice 11 two sides' first jet platform 1112 of plane, first atomizing ring slit 1111 with first jet orifice 11 is concentric circle, and is established in first jet orifice 11's immediate periphery, first atomizing ring slit 1111's airflow is used for blowing the paint that first jet orifice 11 sprays into mist, a pair of first jet platform 1112's opposite face presents downward first slope 11121, on first slope 11121 each is equipped with at least one first jet hole 11122 (in this embodiment, first jet hole 11122 is two, wherein one diameter is greater than the diameter of another, that is, the diameter of two first jet hole 11122 is not equal), the gas that first jet hole 11122 sprays will first jet orifice 11 sprays paint along the oblique direction and is further atomized. In this embodiment, the included angle of a pair of first slope 11121 is 60 degrees. In order to further improve atomization effect, four first jet holes 11123 are also provided around first atomizing ring slit 1111, so that the sprayed paint atomization is more uniform. The spray gun head in the utility model is realized by 3 groups of independently controllable atomizing holes and 3 groups of independently controllable jet holes. The atomizing holes adopt a special angle to form uniform glaze mist with glaze. Moreover, the jet directions of the three groups of jet holes are staggered, and the spray of each other does not affect the adjacent spray.

[0031] Preferably, the second atomizing hole 121 includes a second atomizing ring slit 1211 and a pair of second jet platforms 1212 higher than the plane of the second jet hole 12 and oppositely arranged on both sides of the second jet hole 12, the second atomizing ring slit 1211 and the second jet hole 12 are concentric circles, and are arranged in the immediate periphery of the second jet hole 12, the airflow of the second atomizing ring slit 1211 is used for blowing the paint sprayed by the second jet hole 12 into mist; the opposite faces of the pair of second jet platforms 1212 are downward second slopes 12121, at least one second jet hole 12122 is arranged on each of the second slopes 12121 (in this embodiment, the second jet hole 12122 is two, wherein one diameter is greater than the diameter of another, that is, the diameter of two second jet hole 12122 is not equal), the gas sprayed by the second jet hole 12122 will further atomize the paint sprayed by the second jet hole 12 in the oblique direction. In this embodiment, the included angle of a pair of second slopes 12121 is 60 degrees (see Figure 1 ). In order to further improve the atomization effect, four second jet holes 12123 are also provided around the second atomizing ring slit 1211, so that the sprayed paint atomization is more uniform (see Figure 2 ).

[0032] Preferably, the third atomizing hole 131 includes a third atomizing annular slit 1311 and a pair of third jet platforms 1312, which are oppositely arranged on both sides of the third jet hole 13 and are higher than the plane of the third jet hole 13. The third atomizing annular slit 1311 and the third jet hole 13 are concentric circles and are located on the outer periphery of the third jet hole 13. The airflow of the third atomizing annular slit 1311 is used to disperse the paint sprayed from the third jet hole 13 into a mist. The opposing surfaces of the pair of third jet platforms 1312 are downward inclined surfaces 13121. At least one third jet hole 13122 is provided on each of the third inclined surfaces 13121 (in this embodiment, there are two third jet holes 13122, one of which has a larger diameter than the other, that is, the diameters of the two third jet holes 13122 are not equal). The gas sprayed from the third jet holes 13122 further atomizes the paint sprayed from the third jet hole 13 along the inclined direction. In this embodiment, the included angle between the pair of third inclined planes 13121 is 60 degrees (see...). Figure 1 To further improve the atomization effect, four third air jet holes 13123 are also provided around the third atomization annular seam 1311, making the sprayed coating atomized more uniformly (see...). Figure 3 ).

[0033] Preferably, the first nozzle 11 is individually and controllably fed by the first feed pipe 112, and the first atomizing nozzle 111 is individually and controllably fed by the first air inlet pipe 113; the second nozzle 12 is individually and controllably fed by the second feed pipe 114, and the second atomizing nozzle 121 is individually and controllably fed by the second air inlet pipe 115; the third nozzle 13 is individually and controllably fed by the third feed pipe 116, and the third atomizing nozzle 131 is individually and controllably fed by the third air inlet pipe 117 (see...). Figure 4 ). The following is based on Figure 5 To illustrate the structural relationship between the feed pipe and the air inlet pipe within the spray gun head body 1 in this utility model; Figure 5 The explanation will focus solely on the structure of the first feed pipe 112 and the first air inlet pipe 113. Figure 5It can be seen that the first feeding pipe 112 is directly connected with the first spray hole 11 alone and can be controlled to supply material alone (controlling to supply material alone means being connected with a single controllable pressure pressure tank, see below); the first feeding pipe 113 is connected with the first atomizing hole 111 through a first gas supply arc groove 1131, in the embodiment, the first atomizing hole 111 includes a first atomizing ring gap 1111, four first gas injection holes 11122, and four second gas injection holes 11123, the first atomizing ring gap 1111, the first gas injection hole 11122, and the second gas injection hole 11123 are all through the first gas supply arc groove 1131. The connection structure of the second feeding pipe 114 and the second gas supply pipe 115 and the connection structure of the third feeding pipe 116 and the third gas supply pipe 117 are the same as the connection structure of the first feeding pipe 112 and the first gas supply pipe 113, which will not be described here.

[0034] Referring to Figure 6 The relationship between the spray holes and the spray directions thereof can be designed as the first spray direction 1110 of the first spray hole 11, the second spray direction 1210 of the second spray hole 12, and the third spray direction 131 of the third spray hole 13, which are projected in the axial direction of the spray gun head body 1 to be 120 degrees, wherein the second spray direction 1210 of the second spray hole 12 is in a horizontal state. Although the first spray hole 11 and the third spray hole 13 are on the same side of the spray gun head body 1, the first spray direction 1110 of the first spray hole 11 is toward the obliquely upper side, the third spray direction 131 of the third spray hole 13 is toward the obliquely lower side, and the interval distance is relatively far, and the second spray hole 12 is interposed therebetween, so that the spray of the first spray hole 11 and the spray of the third spray hole 13 do not interfere with each other; the second spray hole 12 is arranged in the middle and is relatively close to the first spray hole 11 and the third spray hole 13, but the second spray direction 1210 of the second spray hole 12 is in a horizontal state and is directed away from the spray directions of the first spray hole 11 and the third spray hole 13, so that the second spray direction 1210 of the second spray hole 12 also does not interfere with the sprays generated by the first spray direction 1110 of the first spray hole 11 and the third spray direction 131 of the third spray hole 13.

[0035] Preferably, the diameter of the spray gun head body 1 is selected to be greater than or equal to 20 mm and less than or equal to 53 mm. Preferably, the diameter of the spray gun head body 1 is selected to be greater than or equal to 25 mm and less than or equal to 45 mm. In the embodiment, the diameter of the spray gun head body 1 is 32 mm.

[0036] Please refer to Figures 7 to 9The utility model also provides a spray gun, including spray gun extension pole 2 and water heater inner bag automatic spray ladle spray gun head 3, water heater inner bag automatic spray ladle spray gun head 3 is above-mentioned water heater inner bag automatic spray ladle spray gun head.

[0037] Preferably, 3 root feed pipes 21 and 3 root gas pipes 22 are arranged in the spray gun extension pole 2, one end of 3 root feed pipes 21 is connected with first feed pipe 112, second feed pipe 114 and third feed pipe 116 respectively one by one, one end of 3 root gas pipes 22 is connected with first gas pipe 113, second gas pipe 115 and third gas pipe 117 respectively one by one, the other end of 3 root feed pipes 21 is connected with three controllable pressure pressure barrels (not shown), the other end of 3 root gas pipes 22 is connected with three controllable pressure compressed air sources (not shown), or the other end of gas pipes 22 is connected with a compressed air source (not shown) through three pressure reducing valves (not shown) respectively.

[0038] In the utility model, the spray gun extension pole 2 is connected with the atomizing hole and the spray hole of the spray gun head 3 one by one, a sealing gasket 16 is used in the middle, the thread 14 outside the spray gun head 3 is locked and connected with the spray gun extension pole 2 through a spray gun connecting nut 17, and it is easy to disassemble, maintain and replace, specifically, a connecting piece 23 is arranged on the spray gun extension pole 2 close to the spray gun head 3, the outer diameter of the connecting piece 23 is greater than the outer diameter of the spray gun extension pole 2 and less than or equal to the outer diameter of the spray gun head 3, six holes are arranged on the connecting piece 23, the six holes are used for fixing three feed pipes 21 and three gas pipes 22 respectively, the positions of all feed pipes 21 and gas pipes 22 correspond to the feed pipe and the gas pipe on the spray gun head 3, a first gap is arranged on the outer edge of the connecting piece 23, the first gap is matched with the anti-fool part 15 at the bottom of the spray gun head 3 (specifically, the anti-fool part 15 is inserted into the first gap to achieve the purpose of positioning the positions of three feed pipes 21 and three gas pipes 22), and the feed pipe 21 and the gas pipe 22 on the connecting piece 23 correspond to the atomizing hole and the spray hole of the spray gun head 3 one by one, six perforations are also arranged on the sealing gasket 16, and a second gap is arranged on the outer edge of the sealing gasket 16, and the anti-fool part 15 is also inserted into the second gap to position the positions of the six perforations on the sealing gasket 16 and three feed pipes 21 and three gas pipes 22 on the positioning piece.

[0039] The spray gun extension pole 2 can adopt a seamless light pipe with an outer diameter φ32 and an inner diameter φ28, and six φ7*inner diameter φ5 feed pipes 21 and gas pipes 22 are arranged in the seamless light pipe, a special joint is arranged at the upper end of the spray gun extension pole 2, the six φ7*inner diameter φ5 pipes can be fixed, and the corresponding holes of the spray gun head 3 can be aligned, and the other section of the spray gun extension pole 2 leads out a two-way joint and is connected with a glaze pipe and a gas pipe (not shown).

[0040] In the utility model, each spray hole and atomizing hole is finally connected with a set of pressure barrel and compressed air, the pressure of the pressure barrel and the pressure of the compressed air can be set independently, and the start and stop and the spraying amount and spraying range can be controlled independently, so that different spraying amount and atomizing effect can be achieved.

[0041] When the three sets of nozzles of the novel special spraying gun for automatic enameled spraying of water heater liner work simultaneously, the covering area of the glaze mist can reach 170°, and the inner wall enameled spraying operation of the small caliber water heater liner can be completely adapted.

[0042] When spraying the small caliber water heater liner, the novel special spraying gun for automatic enameled spraying of water heater liner is fixed in the bottom elevator, the liner is rotated after positioning, the spraying gun starts to spray when the spraying gun is stretched to the liner mouth, and the spraying gun is retracted after being stretched into the upper end cover of the liner by a certain distance, so that the ideal coating can be realized by one reciprocation.

[0043] The coating in the utility model mainly refers to glaze, and of course, the utility model can also be used for spraying other coatings, such as paint.

[0044] Although the preferred embodiments of the utility model have been described, those skilled in the art can make further changes and modifications to the embodiments once the basic creative concept is known. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the utility model. Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and changes of the utility model fall within the scope of the claims of the utility model and the equivalent technology, the utility model also intends to include these changes and modifications.

Claims

1. An automatic spray gun head for spraying paint into the inner tank of a small-diameter water heater, comprising a spray gun head body (1), and a first spray hole (11), a second spray hole (12), and a third spray hole (13) disposed on the spray gun head body (1) for spraying paint, and a first atomizing hole (111), a second atomizing hole (121), and a third atomizing hole (131) for atomizing the paint respectively in conjunction with the first spray hole (11), the second spray hole (12), and the third spray hole (13), characterized in that, The first nozzle (11), the second nozzle (12) and the third nozzle (13) are arranged in an alternating pattern in the upper, middle and lower directions in the axial direction of the spray gun head body (1). The first nozzle (11) located at the top sprays towards one side at an angle, the third nozzle (13) located at the bottom sprays towards the angle, and the second nozzle (12) located in the middle sprays towards the horizontal direction.

2. The automatic spray gun head for small-diameter water heater inner tank according to claim 1, characterized in that... The first nozzle (11) is supplied with material by the first feed pipe in a controllable manner, and the first atomizing nozzle (111) is supplied with air by the first air inlet pipe in a controllable manner; the second nozzle (12) is supplied with material by the second feed pipe in a controllable manner, and the second atomizing nozzle (121) is supplied with air by the second air inlet pipe in a controllable manner; the third nozzle (13) is supplied with material by the third feed pipe in a controllable manner, and the third atomizing nozzle (131) is supplied with air by the third air inlet pipe in a controllable manner.

3. The automatic spray gun head for small-diameter water heater inner tank according to claim 1 or 2, characterized in that... The first spray direction (1110) of the first nozzle (11), the second spray direction (1210) of the second nozzle (12) and the third spray direction (1310) of the third nozzle (13) are projected at 120 degrees in the axial direction of the spray gun head body (1), wherein the second spray direction (1210) of the second nozzle (12) is horizontal.

4. The automatic spray gun head for the inner tank of a small-diameter water heater according to claim 1 or 2, characterized in that... The diameter of the spray gun head body (1) is selected between 20 mm and 53 mm.

5. The automatic spray gun head for the inner tank of a small-diameter water heater according to claim 1 or 2, characterized in that... The diameter of the spray gun head body (1) is selected between 25 mm and 45 mm.

6. The automatic spray gun head for small-diameter water heater inner tank according to claim 1 or 2, characterized in that... The first atomizing hole (111) includes a first atomizing annular slit (1111) and a pair of first jet platforms (1112) that are opposite to each other on both sides of the first jet hole (11) and are higher than the plane of the first jet hole (11). The first atomizing annular slit (1111) and the first jet hole (11) are concentric circles and are located on the outer periphery of the first jet hole (11). The airflow of the first atomizing annular slit (1111) is used to blow the paint sprayed from the first jet hole (11) into a mist. The opposite surfaces of the pair of first jet platforms (1112) are downward inclined surfaces (11121). At least one first jet hole (11122) is provided on each of the first inclined surfaces (11121). The gas sprayed from the first jet hole (11122) further atomizes the paint sprayed from the first jet hole (11) along the inclined direction.

7. The automatic spray gun head for small-diameter water heater inner tank according to claim 1 or 2, characterized in that... The second atomizing hole (121) includes a second atomizing annular slit (1211) and a pair of second jet platforms (1212) that are opposite to each other on both sides of the second jet hole (12) and are higher than the plane of the second spray hole (12). The second atomizing annular slit (1211) and the second spray hole (12) are concentric circles and are located on the outer periphery of the second spray hole (12). The airflow of the second atomizing annular slit (1211) is used to blow the paint sprayed from the second spray hole (12) into a mist. The opposite surfaces of the pair of second jet platforms (1212) are downward inclined surfaces (12121). At least one second jet hole (12122) is provided on each of the second inclined surfaces (12121). The gas sprayed from the second jet hole (12122) further atomizes the paint sprayed from the second spray hole (12) along the inclined direction.

8. The automatic spray gun head for small-diameter water heater inner tank according to claim 1 or 2, characterized in that... The third atomizing hole (131) includes a third atomizing annular slit (1311) and a pair of third jet platforms (1312) arranged opposite each other on both sides of the third jet hole (13) above the plane of the third spray hole (13). The third atomizing annular slit (1311) and the third spray hole (13) are concentric circles and are located on the outer periphery of the third spray hole (13). The airflow of the third atomizing annular slit (1311) is used to disperse the paint sprayed from the third spray hole (13) into a mist. The opposing surfaces of the pair of third jet platforms (1312) are downward-facing third inclined surfaces (13121). At least one third jet hole (13122) is provided on each of the third inclined surfaces (13121). The gas sprayed from the third jet hole (13122) further atomizes the paint sprayed from the third spray hole (13) along the inclined direction.

9. A spray gun, characterized in that... The device includes a spray gun extension rod (2) and an automatic spray gun head for water heater inner tank, wherein the automatic spray gun head for water heater inner tank is the automatic spray gun head for water heater inner tank as described in any one of claims 1 to 8.

10. The spray gun according to claim 9, characterized in that... The spray gun extension rod (2) is provided with three material conveying pipes (21) and three air conveying pipes (22). One end of the three material conveying pipes (21) is connected to the first feed pipe, the second feed pipe and the third feed pipe respectively. One end of the three air conveying pipes (22) is connected to the first air inlet pipe, the second air inlet pipe and the third air inlet pipe respectively. The other end of the three material conveying pipes (21) is connected to three pressure tanks with controllable pressure respectively. The other end of the three air conveying pipes (22) is connected to three compressed air sources with controllable pressure respectively or connected to one compressed air source through three pressure reducing valves.

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