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. The problem that airflow of mist sprayed by adjacent spray holes interferes with each other does not exist.

Description

Technical Field

[0001] The invention relates to the technical field of enameling the inner tank of a small-caliber water heater, in particular to an automatic enameling spray gun head for the inner tank of a small-caliber water heater and a spray gun thereof. Background Art

[0002] The inner tank of a water heater generally consists of three welded parts: the top cover, the tank body and the lower cover. To spray the inner wall of the water heater tank, it is often necessary to combine multiple spray guns. Generally, three spray guns are inserted into the tank at the same time, one spray gun sprays the inner wall of the top cover of the tank, one spray gun sprays the inner wall of the tank body, and one spray gun sprays the lower cover of the tank. However, this combination is only suitable for spraying the inner wall of the water heater tank with a flange diameter of ≥φ85mm. For the inner tank with a flange diameter of a small-diameter water heater tank less than or equal to φ55mm, if a three-spray gun combination is used, the volume is too large to be inserted into the tank.

[0003] In order to solve the above problems, Chinese patent document CN 116921093 A discloses a spray gun head and a spray gun for spraying the inner surface of a small-caliber container, wherein the spray gun head includes a spray gun head body, a first channel is provided from the spray gun head body to the inside of 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, and the two first atomizing holes are connected through the second channel, a second atomizing hole is provided on both sides of the second spray hole, and the two second atomizing holes are connected through the second channel, and a third atomizing hole is provided on both sides of the third spray hole, and the two third spray holes are connected through the second channel. Therefore, the spray gun head and its spray gun have the advantages of replacing the function of three spray guns with one spray gun, lower use cost, wider spraying range, better spraying effect, and can greatly improve the spraying efficiency.

[0004] However, when using this spray gun head, there is a problem of mutual interference between the airflows of the sprays from adjacent spray holes; secondly, there is a large amount of returned material, which causes glaze marks on the lower part of the gallbladder body and the inner wall of the lower cover. Summary of the invention

[0005] The invention provides a small-caliber water heater inner tank automatic enameling spray gun head and a spray gun thereof without mutual interference of spray airflows of adjacent spray holes.

[0006] Another object of the present invention is that the amount of returned material is small, and no traces of glaze flow will be caused on the lower part of the gallbladder body and the inner wall of the lower cover.

[0007] The technical solution of the present invention is to provide a spray gun head for automatic spraying of water heater inner tank, including a spray gun head body, and a first spray hole, a second spray hole and a third spray hole arranged on the spray gun head body for spraying paint, and a first atomization hole, a second atomization hole and a third atomization hole for respectively cooperating with the first spray hole, the second spray hole and the third spray hole to atomize the paint, wherein the first spray hole, the second spray hole and the third spray hole are arranged in a three-dimensional staggered manner in the axial direction of the spray gun head body, wherein the first spray hole located in the upper part sprays obliquely upward on one side, the third spray hole located in the lower part sprays obliquely downward, and the second spray hole located in the middle part sprays in a horizontal direction.

[0008] As an improvement to the present invention, the first spray hole is independently controllably supplied with material by a first feed pipe, and the first atomization hole is independently controllably supplied with air by a first air inlet pipe; the second spray hole is independently controllably supplied with material by a second feed pipe, and the second atomization hole is independently controllably supplied with air by a second air inlet pipe; the third spray hole is independently controllably supplied with material by a third feed pipe, and the third atomization hole is independently controllably supplied with air by a third air inlet pipe.

[0009] As an improvement to the present invention, the first spray direction of the first spray hole, the second spray direction of the second spray hole and the third spray direction of the third spray hole are projected at 120 degrees in the axial direction of the spray gun head body, wherein the second spray direction of the second spray hole is horizontal.

[0010] As an improvement to the present invention, the diameter of the spray gun head body is selected between greater than or equal to 20 mm and less than or equal to 53 mm.

[0011] As an improvement to the present invention, the diameter of the spray gun head body is selected between greater than or equal to 25 mm and less than or equal to 45 mm.

[0012] As an improvement to the present invention, the first atomizing hole includes a first atomizing annular slit and a pair of first jet platforms that are higher than the plane where the first jet hole is located and are relatively arranged on both sides of the first jet hole. The first atomizing annular slit is concentric with the first jet hole and is arranged on the outer periphery of the first jet hole that is adjacent to the first jet hole. The airflow of the first atomizing annular slit is used to blow the paint sprayed from the first jet hole into mist; the opposite surfaces of a pair of the first jet platforms are first downward inclined surfaces, and at least one first jet hole is respectively arranged on the first inclined surfaces. The gas sprayed from the first jet hole further atomizes the paint sprayed from the first jet hole along the inclined direction.

[0013] As an improvement to the present invention, the second atomizing hole includes a second atomizing annular slit and a pair of second jet platforms that are higher than the plane where the second jet hole is located and are relatively arranged on both sides of the second jet hole. The second atomizing annular slit is concentric with the second jet hole and is arranged on the outer periphery of the second jet hole. The airflow of the second atomizing annular slit is used to blow the paint sprayed from the second jet hole into mist; the opposite surfaces of a pair of second jet platforms are downward second inclined surfaces, and at least one second jet hole is respectively arranged on the second inclined surfaces. The gas sprayed from the second jet hole further atomizes the paint sprayed from the second jet hole along the oblique direction.

[0014] As an improvement to the present invention, the third atomizing hole includes a third atomizing annular slit and a pair of third jet platforms higher than the plane where the third jet hole is located and relatively arranged on both sides of the third jet hole, the third atomizing annular slit and the third jet hole are concentric circles and are arranged on the outer periphery immediately adjacent to the third jet hole, and the airflow of the third atomizing annular slit is used to blow the paint sprayed from the third jet hole into mist; the opposing surfaces of a pair of the third jet platforms are third inclined surfaces facing downward, and at least one third jet hole is respectively arranged on the third inclined surfaces, and the gas sprayed from the third jet hole further atomizes the paint sprayed from the third jet hole along the oblique direction.

[0015] The present invention also provides a spray gun, comprising a spray gun extension rod and a water heater inner tank automatic spraying spray gun head, wherein the water heater inner tank automatic spraying spray gun head is the above-mentioned water heater inner tank automatic spraying spray gun head.

[0016] As an improvement to the present invention, three material delivery pipes and three air delivery pipes are provided in the spray gun extension rod, and one end of the three material delivery pipes is respectively connected to the first feed pipe, the second feed pipe and the third feed pipe in a one-to-one correspondence; one end of the three air delivery pipes is respectively connected to the first air inlet pipe, the second air inlet pipe and the third air inlet pipe in a one-to-one correspondence; the other ends of the three material delivery pipes are respectively connected to three pressure barrels with controllable pressures; the other ends of the three air delivery pipes are respectively connected to three compressed air sources with controllable pressures or to one compressed air source through three pressure reducing valves.

[0017] The present invention adopts a structure in which the first spray hole, the second spray hole and the third spray hole are arranged in an upper, middle and lower three-dimensional staggered manner in the axial direction of the spray gun head body, wherein the first spray hole located in the upper part sprays obliquely upward on one side, the third spray hole located in the lower part sprays obliquely downward, and the second spray hole located in the middle part sprays in a horizontal direction opposite to the spraying direction of the first spray hole. In this way, the first spray hole, the second spray hole and the third spray hole are staggered in three dimensions, that is, the first spray hole and the third spray hole are respectively located in the upper part and the lower part, and the distance between the two is relatively far, and the problem of mutual interference of airflow will not occur; the present invention arranges the second spray hole between the first spray hole and the third spray hole. Although the second spray hole is relatively close to the first spray hole and the third spray hole, the spray direction of the second spray hole is different from the spray direction of the first spray hole and the third spray hole. In this way, the second spray hole, the first spray hole and the third spray hole will not cause the problem of mutual interference of airflow. Therefore, the present invention well solves the problem of mutual interference of spray airflows of adjacent spray holes in the prior art.

[0018] The present invention also adopts a structure in which the first spray hole is independently and controllably supplied with material by the first feed pipe, the first atomizing hole is independently and controllably supplied with air by the first air inlet pipe; the second spray hole is independently and controllably supplied with material by the second feed pipe, the second atomizing hole is independently and controllably supplied with air by the second air inlet pipe; the third spray hole is independently and controllably supplied with material by the third feed pipe, the third atomizing hole is independently and controllably supplied with air by the third air inlet pipe, so that spraying can be performed separately as needed. For example, if the inner wall of the top cover is to be sprayed, only the first spray hole and the first atomizing hole are used, while the second spray hole and the second atomizing hole, as well as the third spray hole and The third atomizing hole is stopped from use, so that excess paint will not be sprayed out from the second spray hole and the third spray hole, resulting in a large amount of returned material and the problem of glaze flow marks on the lower part of the gallbladder body and the inner wall of the lower cover; when it is necessary to spray the inner wall of the gallbladder body, only the second spray hole and the second atomizing hole are used, and the other two spray holes and atomizing holes are stopped from use; when it is necessary to spray the inner wall of the lower cover, only the third spray hole and the third atomizing hole are used, and the other two spray holes and atomizing holes are also stopped from use, both of which can achieve the purpose of small amount of returned material and no glaze flow marks on the lower part of the gallbladder body and the inner wall of the lower cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the planar structure of an embodiment of the spray gun head of the present invention.

[0020] Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure of the embodiment shown.

[0021] Figure 3 yes Figure 2 Schematic diagram of the three-dimensional structure from another perspective.

[0022] Figure 4 yes Figure 2 Schematic diagram of the three-dimensional structure from another perspective.

[0023] Figure 5 yes Figure 1 A schematic diagram of the structure of the air intake and feed of the illustrated embodiment.

[0024] Figure 6 It is a schematic diagram of an embodiment of a top view projection structure of three nozzle holes of the present invention.

[0025] Figure 7 It is a schematic diagram of the planar structure of an embodiment of a spray gun of the present invention.

[0026] Figure 8 yes Figure 7 Schematic diagram of the cross-sectional structure of HH.

[0027] Fig. 9 yes Figure 8 The enlarged structural diagram at position I in FIG. DETAILED DESCRIPTION

[0028] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. like Figures 1 to 5 As shown, Figures 1 to 5 The invention discloses an automatic spray gun head for spraying paint on a water heater liner, which is suitable for use with 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. The invention comprises a spray gun head body 1, and a first spray hole 11 and a second spray hole 12 (see FIG. 1 ) for spraying paint on the spray gun head body 1. Figure 3 ) and the third nozzle 13 (see Figure 2 ), a first atomizing hole 111, a second atomizing hole 121 and a third atomizing hole 131 for respectively cooperating with the first spray hole 11, the second spray hole 12 and the third spray hole 13 to atomize the paint, wherein the first spray hole 11, the second spray hole 12 and the third spray hole 13 are arranged in a three-dimensional staggered manner in the axial direction of the spray gun head body 1, and the first spray hole 11 located at the upper part sprays obliquely upward on one side, the third spray hole 13 located at the lower part sprays obliquely downward, and the second spray hole 12 located in the middle part sprays in a horizontal direction.

[0029] In the present invention, the first atomizing hole 111 includes a first atomizing annular slit 1111 and a pair of first jet platforms 1112 higher than the plane where the first jet hole 11 is located and relatively arranged on both sides of the first jet hole 11, the first atomizing annular slit 1111 and the first jet hole 11 are concentric circles and arranged at the outer periphery of the first jet hole 11, and the airflow of the first atomizing annular slit 1111 is used to blow the paint sprayed from the first jet hole 11 into mist; the opposite surfaces of the pair of first jet platforms 1112 are downward first inclined surfaces 11121, and at least one first jet hole 11122 is arranged on each of the first inclined surfaces 11121 (in this embodiment, there are two first jet holes 11122, one of which has a diameter greater than the other, that is, the diameters of the two first jet holes 11122 are not equal), and the gas sprayed from the first jet hole 11122 further atomizes the paint sprayed from the first jet hole 11 in an oblique direction. In this embodiment, the angle between the pair of first inclined surfaces 11121 is 60 degrees. In order to further improve the atomization effect, four first jet holes 11123 are provided around the first atomization annular gap 1111, so that the sprayed paint is atomized more evenly. The spray gun head of the present invention is sprayed by three groups of independently controllable atomization holes and three groups of independently controllable spray holes. The atomization holes form uniform glaze mist with the glaze at a special angle, and the spray directions of the three groups of spray holes are staggered, so that each other's spray will not affect the adjacent spray.

[0030] Preferably, the second atomizing hole 121 includes a second atomizing annular slit 1211 and a pair of second jet platforms 1212 that are higher than the plane where the second nozzle hole 12 is located and are relatively arranged on both sides of the second nozzle hole 12. The second atomizing annular slit 1211 and the second nozzle hole 12 are concentric circles and are arranged on the outer periphery of the second nozzle hole 12. The airflow of the second atomizing annular slit 1211 is used to blow the paint sprayed from the second nozzle hole 12 into mist; the opposing surfaces of a pair of second jet platforms 1212 present a downward second inclined surface 12121, and at least one second jet hole 12122 is provided on each of the second inclined surfaces 12121 (in this embodiment, there are two second jet holes 12122, one of which has a diameter greater than the other, that is, the diameters of the two second jet holes 12122 are not equal), and the gas sprayed from the second jet hole 12122 further atomizes the paint sprayed from the second nozzle hole 12 in an oblique direction. In this embodiment, the angle between the pair of second inclined surfaces 12121 is 60 degrees (see Figure 1 In order to further improve the atomization effect, four second jet holes 12123 are provided around the second atomization annular gap 1211, so that the sprayed paint is atomized more evenly (see Figure 2 ).

[0031] Preferably, the third atomizing hole 131 includes a third atomizing annular slit 1311 and a pair of third jet platforms 1312 which are higher than the plane where the third jet hole 13 is located and are relatively arranged on both sides of the third jet hole 13, the third atomizing annular slit 1311 and the third jet hole 13 are concentric circles and are arranged on the outer periphery of the third jet hole 13, and the airflow of the third atomizing annular slit 1311 is used to blow the paint sprayed from the third jet hole 13 into mist; the opposing surfaces of a pair of the third jet platforms 1312 are third inclined surfaces 13121 facing downward, and at least one third jet hole 13122 is respectively arranged on the third inclined surfaces 13121 (in this embodiment, there are two third jet holes 13122, one of which has a diameter greater than the other, that is, the diameters of the two third jet holes 13122 are not equal), and the gas sprayed from the third jet hole 13122 further atomizes the paint sprayed from the third jet hole 13 in an oblique direction. In this embodiment, the angle between the pair of third inclined surfaces 13121 is 60 degrees (see Figure 1 In order to further improve the atomization effect, four third jet holes 13123 are provided around the third atomization annular gap 1311, so that the sprayed paint is atomized more evenly (see Figure 3 ).

[0032] Preferably, the first spray hole 11 is independently and controllably supplied with material by the first feed pipe 112, and the first atomization hole 111 is independently and controllably supplied with air by the first air inlet pipe 113; the second spray hole 12 is independently and controllably supplied with material by the second feed pipe 114, and the second atomization hole 121 is independently and controllably supplied with air by the second air inlet pipe 115; the third spray hole 13 is independently and controllably supplied with material by the third feed pipe 116, and the third atomization hole 131 is independently and controllably supplied with air by the third air inlet pipe 117 (see Figure 4 ). Figure 5 To illustrate the structural relationship between the feed pipe and the air intake pipe in the spray gun head body 1 of the present invention; Figure 5 Only the structures of the first feed pipe 112 and the first air intake pipe 113 are used for illustration. Figure 5It can be seen that the first feed pipe 112 is directly connected to the first nozzle 11 separately, and the feed can be controlled separately (single control feed means connecting with a pressure barrel with controllable pressure, see below); the first air inlet pipe 113 is connected to the first atomizing hole 111 through the first air supply arc slot 1131. In this embodiment, the first atomizing hole 111 includes a first atomizing annular gap 1111, four first jet holes 11122, and four second jet holes 11123. The first atomizing annular gap 1111, the first jet holes 11122, and the second jet holes 11123 are all connected to the first air supply arc slot 1131. As for the connection structure of the second feed pipe 114 and the second air inlet pipe 115, and the connection structure of the third feed pipe 116 and the third air inlet pipe 117, they are the same as the connection structure of the first feed pipe 112 and the first air inlet pipe 113 mentioned above, and will not be repeated here.

[0033] See also Figure 6 The relationship between the spray hole and its spray direction of the present invention can be designed as a first spray direction 1110 of the first spray hole 11, a second spray direction 1210 of the second spray hole 12 and a third spray direction 131 of the third spray hole 13, the projection of which in the axial direction of the spray gun head body 1 is 120 degrees, wherein the second spray direction 1210 of the second spray hole 12 is in a horizontal state. In this design, 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 directed obliquely upward, while the third spray direction 131 of the third spray hole 13 is directed obliquely downward, and the distance between them is relatively far, with the second spray hole 12 in between, so the spray of the first spray hole 11 and the spray of the third spray hole 13 will not interfere with each other; although 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, the second spray direction 1210 of the second spray hole 12 is horizontal and is directed away from the spray directions of the first spray hole 11 and the third spray hole 13, so the second spray direction 1210 of the second spray hole 12 will not interfere with the spray 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.

[0034] Preferably, the diameter of the spray gun head body 1 is selected between 20 mm or more and 53 mm or less. Preferably, the diameter of the spray gun head body 1 is selected between 25 mm or more and 45 mm or less. In this embodiment, the diameter of the spray gun head body 1 is 32 mm.

[0035] See also Figure 7-Figure 9The present invention further provides a spray gun, comprising a spray gun extension rod 2 and a water heater inner tank automatic spraying spray gun head 3, wherein the water heater inner tank automatic spraying spray gun head 3 is the above-mentioned water heater inner tank automatic spraying spray gun head.

[0036] Preferably, three material delivery pipes 21 and three air delivery pipes 22 are provided in the spray gun extension rod 2, and one end of the three material delivery pipes 21 is respectively connected to the first feed pipe 112, the second feed pipe 114 and the third feed pipe 116 in a one-to-one correspondence; one end of the three air delivery pipes 22 is respectively connected to the first air inlet pipe 113, the second air inlet pipe 115 and the third air inlet pipe 117 in a one-to-one correspondence; the other ends of the three material delivery pipes 21 are respectively connected to three pressure barrels (not shown) with controllable pressures; the other ends of the three air delivery pipes 22 are respectively connected to three compressed air sources (not shown) with controllable pressures; or, the other ends of the air delivery pipes 22 are respectively connected to a compressed air source (not shown) through three pressure reducing valves (not shown).

[0037] In the present invention, the spray gun extension rod 2 is connected to the atomization hole and the spray hole of the spray gun head 3 in a one-to-one correspondence, and a sealing gasket 16 is used in the middle. The thread 14 on the outside of the spray gun head 3 is locked and connected to the spray gun extension rod 2 through a spray gun connecting nut 17, which is easy to disassemble and repair and replace; specifically, a connecting piece 23 is provided near the spray gun head 3 on the spray gun extension rod 2, and the outer diameter of the connecting piece 23 is larger than the outer diameter of the spray gun extension rod 2 and less than or equal to the outer diameter of the spray gun head 3. Six holes are provided on the connecting piece 23, and the six holes are respectively used to fix three material delivery pipes 21 and three air delivery pipes 22. The positions of all material delivery pipes 21 and air delivery pipes 22 are consistent with the feed pipe and air intake pipe on the spray gun head 3. Corresponding to the tube, a first notch is provided on the outer edge of the connecting piece 23, and the first notch cooperates with the anti-foolproofing piece 15 at the bottom of the spray gun head 3 (specifically, the anti-foolproofing piece 15 is inserted into the first notch to achieve the purpose of positioning the three material delivery pipes 21 and the three air delivery pipes 22), ensuring that the material delivery pipes 21 and the air delivery pipes 22 on the connecting piece 23 correspond one-to-one to the atomization holes and the spray holes of the spray gun head 3; 6 perforations are also provided on the sealing gasket 16, and similarly, a second notch is provided on the outer edge of the sealing gasket 16, and the anti-foolproofing piece 15 is also inserted into the second notch to position the 6 perforations on the sealing gasket 16 with the three material delivery pipes 21 and the three air delivery pipes 22 on the positioning piece.

[0038] The spray gun extension rod 2 can be made of a seamless smooth tube with an outer diameter of φ32 and an inner diameter of φ28, and has six material delivery pipes 21 and an air delivery pipe 22 with an inner diameter of φ7 and φ5, and a special joint is used at the upper end of the spray gun extension rod 2 to fix the six tubes with an inner diameter of φ7 and φ5, so as to facilitate alignment with the corresponding holes of the spray gun head 3. The other end of the spray gun extension rod 2 leads to a two-point joint, which is connected to the glaze pipe and the air pipe (not shown).

[0039] In the present invention, each spray hole and atomization hole is ultimately connected to a set of pressure barrels and compressed air separately. The pressure of the pressure barrel and the pressure of the compressed air can be set separately, and the start and stop as well as the spraying amount and spray width can be independently controlled to achieve different spraying amounts and atomization effects.

[0040] When the three sets of nozzles of the new automatic enameling spray gun for water heater inner tank of the present invention work simultaneously, the coverage area of ​​glaze mist can reach 170 degrees, which is fully suitable for the inner wall enameling operation of small-caliber water heater inner tank.

[0041] When spraying the inner tank of a small-diameter water heater, the new automatic spray gun for the inner tank of the water heater is fixed in the bottom elevator, and the inner tank is rotated after being positioned. When the spray gun reaches the inner tank opening, the spray gun starts to spray the enamelled coating until the spray gun is extended into the upper end cover of the inner tank for a certain distance and then retracted. An ideal coating can be achieved by one reciprocating motion.

[0042] The coating in the present invention mainly refers to glaze. Of course, the present invention can also be used for spraying other coatings, such as paints.

[0043] Although preferred embodiments of the present invention have been described, additional changes and modifications may be made to these embodiments by those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A small-caliber water heater tank automatic spray gun head, comprising a spray gun head body (1), and a first spray hole (11), a second spray hole (12) and a third spray hole (13) arranged 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 respectively cooperating with the first spray hole (11), the second spray hole (12) and the third spray hole (13) to atomize the paint, characterized in that: The first spray hole (11), the second spray hole (12) and the third spray hole (13) are arranged in a three-dimensional staggered manner in the axial direction of the spray gun head body (1), with the first spray hole (11) located in the upper part spraying in an obliquely upward direction on one side, the third spray hole (13) located in the lower part spraying in an obliquely downward direction, and the second spray hole (12) located in the middle part spraying in a horizontal direction.

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

3. The automatic spray gun head for spraying the inner tank of a small-caliber water heater according to claim 1 or 2, characterized in that : The projection of the first spray direction (111) of the first spray hole (11), the second spray direction (121) of the second spray hole (12) and the third spray direction (131) of the third spray hole (13) in the axial direction of the spray gun head body (1) is 120 degrees, wherein the second spray direction (121) of the second spray hole (12) is in a horizontal state.

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

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

6. The automatic spray gun head for spraying the inner tank of a small-caliber water heater according to claim 1 or 2, characterized in that The first atomizing hole (111) comprises a first atomizing annular slit (1111) and a pair of first jet platforms (1112) which are higher than the plane where the first jet hole (11) is located and are relatively arranged on both sides of the first jet hole (11); the first atomizing annular slit (1111) and the first jet hole (1111) are concentric circles and are arranged on the outer periphery of the first jet hole (11), and the airflow of the first atomizing annular slit (1111) is used to blow the paint sprayed from the first jet hole (11) into mist; the opposing surfaces of the pair of first jet platforms (1112) are first inclined surfaces (11121) facing downward, and at least one first jet hole (11122) is respectively arranged on the first inclined surfaces (11121); the gas sprayed from the first jet holes (11122) further atomizes the paint sprayed from the first jet hole (11) along an inclined direction.

7. The automatic spray gun head for spraying the inner tank of a small-caliber water heater according to claim 1 or 2, characterized in that The second atomizing hole (121) comprises a second atomizing annular slit (1211) and a pair of second jet platforms (1212) which are higher than the plane where the second jet hole (12) is located and are relatively arranged on both sides of the second jet hole (12); the second atomizing annular slit (1211) and the second jet hole (12) are concentric circles and are arranged on the outer periphery of the second jet hole (12); the airflow of the second atomizing annular slit (1211) is used to blow the paint sprayed from the second jet hole (12) into mist; the opposing surfaces of the pair of second jet platforms (1212) are second inclined surfaces (12121) facing downwards, and at least one second jet hole (12122) is respectively arranged on the second inclined surfaces (12121); the gas sprayed from the second jet holes (12122) further atomizes the paint sprayed from the second jet hole (12) in an oblique direction.

8. The automatic enameling spray gun head for the inner tank of a small-caliber water heater according to claim 1 or 2, characterized in that The third atomizing hole (131) comprises a third atomizing annular slit (1311) and a pair of third jet platforms (1312) which are higher than the plane where the third jet hole (13) is located and are relatively arranged on both sides of the third jet hole (13); the third atomizing annular slit (1311) and the third jet hole (13) are concentric circles and are arranged on the outer periphery of the third jet hole (13); the airflow of the third atomizing annular slit (1311) is used to blow the paint sprayed from the third jet hole (13) into mist; the opposing surfaces of the pair of third jet platforms (1312) are third inclined surfaces (13121) facing downwards, and at least one third jet hole (13122) is respectively arranged on the third inclined surfaces (13121); the gas sprayed from the third jet holes (13122) further atomizes the paint sprayed from the third jet hole (13) in an oblique direction.

9. A spray gun, characterized in that : It comprises a spray gun extension rod (2) and a water heater inner tank automatic spraying spray gun head, wherein the water heater inner tank automatic spraying spray gun head is the water heater inner tank automatic spraying spray gun head according to any one of claims 1 to 8.

10. The spray gun according to claim 9, characterized in that : Three material delivery pipes (21) and three air delivery pipes (22) are arranged in the spray gun extension rod (2), one end of the three material delivery pipes (21) is connected to the first material feed pipe, the second material feed pipe and the third material feed pipe respectively; one end of the three air delivery pipes (22) is connected to the first air inlet pipe, the second air inlet pipe and the third air inlet pipe respectively; the other ends of the three material delivery pipes (21) are connected to three pressure barrels with controllable pressures; the other ends of the three air delivery pipes (22) are connected to three compressed air sources with controllable pressures or are connected to one compressed air source through three pressure reducing valves.

Images