Injection device

Abstract

The utility model provides a spraying device which comprises a spraying device body and a spraying head, the spraying device body is provided with a conveying channel, the spraying head is provided with a spraying channel, the spraying head is arranged on the spraying device body, and the spraying channel communicates with the conveying channel; the spraying channel comprises a first spraying channel and a second spraying channel, and the first spraying channel is located between the conveying channel and the second spraying channel; the cross-sectional area of one end, close to the conveying channel, of the first spraying channel is smaller than that of one end, close to the second spraying channel, of the first spraying channel; the section area of one end of the second spraying channel close to the conveying channel is larger than that of one end of the second spraying channel away from the first spraying channel. According to the invention, turbulent flow and vortex are reduced, the damage of the turbulent flow and vortex to the inner wall is avoided, and the noise generated by the turbulent flow and vortex is reduced.

Description

Technical Field

[0001] This application relates to the technical field of spraying equipment, and particularly to spraying devices. Background Art

[0002] Spraying devices are widely used in various fields, including but not limited to industrial painting, agricultural spraying, beauty makeup, medical disinfection, art creation, etc. These tools or devices all have the function of outputting substances in a sprayed form onto the target surface.

[0003] As a type of spraying device, the core function of a spray gun is to atomize and spray liquids, powders or other substances onto the target surface through high pressure or air flow. Currently, when a spray gun is in use, turbulence and eddy currents are generated when the fluid passes through the spray orifice, resulting in a low concentration of the final jet, wear on the inner wall of the spray orifice, and noise. Summary of the Utility Model

[0004] In order to overcome the defects of the above-mentioned prior art, this application provides a spraying device, and the specific technical solutions are as follows:

[0005] The spraying device includes a spraying device main body and a spray head. The spraying device main body has a conveying channel, and the spray head has a spraying channel. The spray head is arranged on the spraying device main body, and the spraying channel is communicated with the conveying channel;

[0006] The spraying channel includes a first spraying channel and a second spraying channel. The first spraying channel is located between the conveying channel and the second spraying channel; the cross-sectional area of one end of the first spraying channel close to the conveying channel is smaller than the cross-sectional area of one end of the first spraying channel close to the second spraying channel; the cross-sectional area of one end of the second spraying channel close to the conveying channel is larger than the cross-sectional area of the end of the second spraying channel far from the first spraying channel.

[0007] In a specific embodiment, the first spraying channel includes two or more first sub-channels arranged in sequence along the spraying direction, and the cross-sectional area of the next-level first sub-channel is larger than that of the upper-level first sub-channel;

[0008] And / or, the second spraying channel includes two or more second sub-channels arranged in sequence along the spraying direction, and the cross-sectional area of the next-level second sub-channel is smaller than that of the upper-level second sub-channel.

[0009] In a specific embodiment, the two or more first sub-channels include a first sub-channel one, a first sub-channel two and a first sub-channel three arranged in sequence along the spraying direction, and the cross-sectional area of the first sub-channel two gradually increases along the spraying direction;

[0010] And / or, two or more of the second sub-channels include a first second sub-channel, a second second sub-channel, and a third second sub-channel arranged in sequence along the jetting direction, and the cross-sectional area of the second second sub-channel gradually decreases along the jetting direction.

[0011] In a specific embodiment, the ratio of the cross-sectional area of the first first sub-channel to the cross-sectional area of the third first sub-channel is between 10% and 90%.

[0012] And / or, the ratio of the cross-sectional area of the third second sub-channel to the cross-sectional area of the first second sub-channel is between 10% and 90%.

[0013] In a specific embodiment, the nozzle head includes a base, a rotating cap, and two or more nozzles. The base is arranged on the main body of the jetting device. The base forms the first jetting channel. Each nozzle forms the second jetting channel. The nozzles are arranged on the rotating cap. The rotating cap is rotatably arranged on the base. The rotating cap is used to rotate under the action of an external force so that the first jetting channel communicates with different second jetting channels.

[0014] In a specific embodiment, two or more of the nozzles are arranged in an annular array.

[0015] Or, jetting holes are arranged on the rotating cap. The jetting holes and two or more of the nozzles are arranged in an annular array. The rotating cap is further used to rotate under the action of an external force so that the first jetting channel communicates with the jetting holes.

[0016] In a specific embodiment, two or more of the nozzles include at least one columnar nozzle. The second jetting channel of the columnar nozzle communicates with the jetting orifice of the columnar nozzle.

[0017] And / or, two or more of the nozzles include at least one umbrella-shaped nozzle. The umbrella-shaped nozzle has a diversion groove. The jetting orifice of the umbrella-shaped nozzle is located on the bottom wall of the diversion groove. The second jetting channel of the umbrella-shaped nozzle communicates with the jetting orifice of the umbrella-shaped nozzle.

[0018] In a specific embodiment, the at least one columnar nozzle includes a first columnar nozzle and a second columnar nozzle. The cross-sectional area of the jetting orifice of the first columnar nozzle is larger than the cross-sectional area of the jetting orifice of the second columnar nozzle.

[0019] And / or, the at least one umbrella-shaped nozzle includes a first umbrella-shaped nozzle and a second umbrella-shaped nozzle. When the second injection channel of the first umbrella-shaped nozzle communicates with the first injection channel, the flow guiding groove of the first umbrella-shaped nozzle extends along a first direction; when the second injection channel of the second umbrella-shaped nozzle communicates with the first injection channel, the flow guiding groove of the second umbrella-shaped nozzle extends along a second direction; the first direction is different from the second direction.

[0020] In a specific embodiment, the base includes a base and a spray core. The base is disposed on the main body of the spraying device, the rotating cap is rotatably disposed on the base, a receiving space is formed between the base and the rotating cap, the spray core is located in the receiving space, the spray core is formed with the first injection channel, and the axis of the first injection channel deviates from the axis of the base.

[0021] In a specific embodiment, an anti-fooling structure is provided on the spray core, and the anti-fooling structure is used to make the installation position of the spray core unique.

[0022] The present application has at least the following beneficial effects:

[0023] The spraying device of the present application includes a main body of the spraying device and a spray head. The main body of the spraying device has a conveying channel, the spray head has an injection channel, the spray head is disposed on the main body of the spraying device, and the injection channel communicates with the conveying channel; the injection channel includes a first injection channel and a second injection channel, and the first injection channel is located between the conveying channel and the second injection channel; the cross-sectional area of one end of the first injection channel close to the conveying channel is smaller than the cross-sectional area of one end of the first injection channel close to the second injection channel; the cross-sectional area of one end of the second injection channel close to the conveying channel is larger than the cross-sectional area of one end of the second injection channel far from the first injection channel.

[0024] By providing the second injection channel with a cross-sectional area decreasing along the injection direction, the present application enables the fluid to be gradually accelerated and focused in the second injection channel, and makes the finally formed jet more concentrated, which can significantly improve the striking force and penetration power of the jet, thereby improving the working efficiency of the spraying device in operations such as spraying, cleaning or fire extinguishing. At the same time, the concentrated jet can reduce the splashing and rebound of the fluid, improve the utilization rate and spraying quality of the fluid. Moreover, due to the more concentrated and stable jet, the user can more easily control the spraying direction and range of the spraying device, improving the accuracy and efficiency of the operation.

[0025] By providing a first injection channel with a cross-sectional area increasing along the injection direction, the present application optimizes the hydrodynamic performance, providing a gradually transitional space for the fluid before it passes through a second injection channel with a cross-sectional area decreasing along the injection direction, enabling the fluid to more smoothly adapt to the change in cross-section, thereby reducing the occurrence of turbulence and eddy currents. At the same time, it avoids damage to the inner wall caused by turbulence and eddy currents, reduces the erosion and wear of the inner wall of the second injection channel by the fluid, and reduces the noise generated by turbulence and eddy currents. Moreover, the first injection channel can guide the fluid to gradually accelerate and stabilize its flow direction, enabling the fluid to enter the second injection channel in a better state, which helps the fluid to more smoothly form a high-speed and stable jet. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 Structural schematic of the injection device provided in this embodiment Figure 1 ;

[0028] Figure 2 is Figure 1 Cross-sectional schematic diagram of line A-A in

[0029] Figure 3 is Figure 2 Local enlarged view of area A in

[0030] Figure 4 Structural schematic of the injection device provided in this embodiment Figure 2 ;

[0031] Figure 5 is Figure 4 Local enlarged view of area B in

[0032] Figure 6 Structural schematic of the injection device provided in this embodiment Figure 3 .

[0033] Reference numerals:

[0034] 1 - Injection device body; 2 - Nozzle; 11 - Delivery channel; 12 - Delivery pipe; 21 - First injection channel; 22 - Second injection channel; 23 - Base; 24 - Rotating cap; 25 - Nozzle; 211 - First sub-channel one; 212 - First sub-channel two; 213 - First sub-channel three; 221 - Second sub-channel one; 222 - Second sub-channel two; 223 - Second sub-channel three; 231 - Base; 232 - Spray core; 241 - Injection hole; 251 - Columnar nozzle; 252 - Umbrella-shaped nozzle; 253 - Flow guiding groove; 2321 - Spray core main body; 2322 - Spray core secondary body; 2323 - Anti-fooling structure; 2411 - Sub-injection hole; 2511 - First columnar nozzle; 2512 - Second columnar nozzle; 2521 - First umbrella-shaped nozzle; 2522 - Second umbrella-shaped nozzle; 23231 - First positioning part; 23232 - Second positioning part. Detailed implementation manners

[0035] In the following, various embodiments of the present application will be described more comprehensively. The present application may have various embodiments, and adjustments and changes may be made therein. However, it should be understood that there is no intention to limit the various embodiments of the present application to the specific embodiments disclosed herein, but the present application should be understood to cover all adjustments, equivalents, and / or alternative solutions falling within the spirit and scope of the various embodiments of the present application.

[0036] In the following, the term "comprise" or "may comprise" that may be used in various embodiments of the present application indicates the presence of the disclosed functions, operations, or elements, and does not limit the addition of one or more functions, operations, or elements. Further, as used in various embodiments of the present application, the terms "comprise", "have" and their cognates are only intended to indicate the presence of specific features, numbers, steps, operations, elements, components, or combinations of the foregoing items, and should not be construed as precluding the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing items first.

[0037] Expressions (such as "first", "second", etc.) used in various embodiments of the present application may modify various components in the various embodiments, but do not limit the corresponding components. For example, the above expressions do not limit the order and / or importance of the elements. The above expressions are only used for the purpose of distinguishing one element from other elements. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, without departing from the scope of the various embodiments of the present application, the first element may be referred to as the second element, and similarly, the second element may also be referred to as the first element.

[0038] It should be noted that: in this application, unless otherwise clearly specified and defined, terms such as "installed", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] In this application, those of ordinary skill in the art need to understand that the terms indicating the orientation or positional relationship in the text are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0040] As Figures 1-6 shown, this embodiment provides a spraying device, including a spraying device main body 1 and a nozzle 2. The spraying device main body 1 has a conveying channel 11, and the nozzle 2 has a spraying channel. The nozzle 2 is arranged on the spraying device main body 1, and the spraying channel is communicated with the conveying channel 11;

[0041] The spraying channel includes a first spraying channel 21 and a second spraying channel 22. The first spraying channel 21 is located between the conveying channel 11 and the second spraying channel 22; the cross-sectional area of one end of the first spraying channel 21 close to the conveying channel 11 is smaller than the cross-sectional area of one end of the first spraying channel 21 close to the second spraying channel 22; the cross-sectional area of one end of the second spraying channel 22 close to the conveying channel 11 is larger than the cross-sectional area of one end of the second spraying channel 22 far from the first spraying channel 21.

[0042] In this embodiment, by setting the second spraying channel 22 with a cross-sectional area decreasing along the spraying direction, the fluid is gradually accelerated and focused in the second spraying channel 22, and the finally formed jet is more concentrated, which can significantly improve the striking force and penetration power of the jet, and further improve the working efficiency of the spraying device in operations such as spraying, cleaning or fire extinguishing. At the same time, the concentrated jet can reduce the splashing and rebound of the fluid, improve the utilization rate and spraying quality of the fluid. Moreover, because the jet is more concentrated and stable, the user can more easily control the spraying direction and range of the spraying device, improving the accuracy and efficiency of the operation.

[0043] In this embodiment, by providing a first injection channel 21 with a cross-sectional area increasing along the injection direction, the hydrodynamic performance is optimized, so that before the fluid passes through a second injection channel 22 with a cross-sectional area decreasing along the injection direction, a gradually transitional space is provided for the fluid, enabling the fluid to more smoothly adapt to the change in cross-section, thereby reducing the occurrence of turbulence and eddy currents. At the same time, damage to the inner wall caused by turbulence and eddy currents is avoided, erosion and wear of the inner wall of the second injection channel 22 by the fluid are reduced, and the noise generated by turbulence and eddy currents is reduced. Moreover, the first injection channel 21 can guide the fluid to gradually accelerate and stabilize its flow direction, so that the fluid enters the second injection channel 22 in a better state, which helps the fluid to more smoothly form a high-speed and stable jet.

[0044] As Figures 4-5 shown, in one embodiment, the nozzle head 2 includes a base 23, a rotating cap 24, and more than two nozzles 25. The base 23 is arranged on the main body 1 of the injection device. The base 23 is formed with a first injection channel 21. Each nozzle 25 is formed with a second injection channel 22. The nozzles 25 are arranged on the rotating cap 24. The rotating cap 24 is rotatably arranged on the base 23. The rotating cap 24 is used to rotate under the action of an external force so that the first injection channel 21 communicates with different second injection channels 22.

[0045] In this embodiment, a plurality of nozzles 25 are arranged on the rotatable rotating cap 24, so that the user can switch the nozzles 25 according to actual usage requirements, and the second injection channel 22 of the required nozzle 25 communicates with the first injection channel 21, so that the jet is ejected in a required state. This embodiment expands the scope of application.

[0046] In one embodiment, more than two nozzles 25 are arranged in a circular array. In this embodiment, by arranging more than two nozzles 25 in a circular array, by rotating the rotating cap 24, the first injection channel 21 is made to communicate with the second injection channel 22 of the nozzle 25.

[0047] As Figures 4-5 shown, in another embodiment, the rotating cap 24 is provided with injection holes 241. The injection holes 241 and more than two nozzles 25 are arranged in a circular array. The rotating cap 24 is also used to rotate under the action of an external force so that the first injection channel 21 communicates with the injection holes 241.

[0048] In this embodiment, by arranging the injection holes 241 and more than two nozzles 25 in a circular array, by rotating the rotating cap 24, the first injection channel 21 is made to communicate with the injection holes 241, and the first injection channel 21 is made to communicate with the second injection channel 22 of the nozzle 25.

[0049] In one embodiment, the ejection holes 241 are composed of a plurality of sub-ejection holes 2411, and the plurality of sub-ejection holes 2411 are arranged in a circular array. Specifically, the sub-ejection holes 2411 are circular or water-drop shaped, but are not limited thereto.

[0050] As Figures 1-3 As shown in FIGS. 5 and 6, in one embodiment, the base 23 includes a base 231 and a spray core 232. The base 231 is disposed on the ejection device main body 1, the rotating cap 24 is rotatably disposed on the base 231, a receiving space is formed between the base 231 and the rotating cap 24, the spray core 232 is located in the receiving space, the spray core 232 is formed with a first ejection channel 21, and the axis of the first ejection channel 21 deviates from the axis of the base 231.

[0051] In one embodiment, one of the rotating cap 24 and the base 231 is provided with a spiral protrusion and the other is provided with a spiral groove, and the spiral protrusion is located in the spiral groove, so that the rotating cap 24 is rotatably disposed on the base 231.

[0052] In one embodiment, the ejection device main body 1 has a delivery pipe 12, a delivery channel 11 is formed in the delivery pipe 12, the base 231 is fixed on the side wall of the delivery pipe 12, and after the delivery pipe 12 passes through the base 231, it contacts the spray core 232, and the delivery channel 11 is communicated with the first ejection channel 21.

[0053] As Figures 1-3 As shown in FIGS. 5 and 6, in one embodiment, the spray core 232 includes a spray core main body 2321 and a spray core secondary body 2322. The spray core main body 2321 is disposed at the end of the delivery pipe 12, an installation channel is formed on the spray core main body 2321, and the installation channel penetrates through the spray core main body 2321, and the installation channel is communicated with the delivery channel 11. The spray core secondary body 2322 is located in the installation channel, the first ejection channel 21 is formed on the spray core secondary body 2322, and the first ejection channel 21 penetrates through the spray core secondary body 2322, and the first ejection channel 21 is communicated with the delivery channel 11 through the installation channel.

[0054] Wherein, an elastic member is disposed between the spray core main body 2321 and the spray core secondary body 2322, and the elastic member is used to squeeze the spray core secondary body 2322 so that the spray core secondary body 2322 abuts against the inner wall of the rotating cap 24.

[0055] As Figure 6As shown, in one embodiment, a foolproof structure 2323 is provided on the spray core. The foolproof structure 2323 is used to make the installation position of the spray core unique. In one embodiment, a first positioning portion 23231 and a second positioning portion 23232 with different lengths are provided on the spray core body 2321. The first positioning portion 23231 and the second positioning portion 23232 constitute the foolproof structure 2323. A first positioning groove corresponding to the first positioning portion 23231 and a second positioning groove corresponding to the second positioning portion 23232 are provided on the delivery pipe 12, so that the spray core body 2321 is installed on the delivery pipe 12 at a unique installation position, which helps to improve the assembly efficiency.

[0056] As Figures 4-5 shown, in one embodiment, two or more nozzles 25 include at least one columnar nozzle 251. The second injection channel 22 of the columnar nozzle 251 communicates with the injection port of the columnar nozzle 251. Two or more nozzles further include at least one umbrella-shaped nozzle 252. The umbrella-shaped nozzle 252 has a diversion groove 253. The injection port of the umbrella-shaped nozzle 252 is located at the bottom wall of the diversion groove 253, so that the fluid moves towards the diversion groove 253 and forms an umbrella-shaped jet. The second injection channel 22 of the umbrella-shaped nozzle 252 communicates with the injection port of the umbrella-shaped nozzle 252.

[0057] In this embodiment, by providing the columnar nozzle 251 and the umbrella-shaped nozzle 252 to provide jets of different shapes, the user can switch the nozzles according to actual usage requirements, expanding the scope of application.

[0058] As Figures 4-5 shown, in one embodiment, at least one columnar nozzle 251 includes a first columnar nozzle 2511 and a second columnar nozzle 2512. The cross-sectional area of the injection port of the first columnar nozzle 2511 is larger than the cross-sectional area of the injection port of the second columnar nozzle 2512.

[0059] In this embodiment, by providing injection ports with different cross-sectional areas for the first columnar nozzle 2511 and the second columnar nozzle 2512, the user can switch between the first columnar nozzle 2511 and the second columnar nozzle 2512 to make the injection device inject jets with different flow rates.

[0060] As Figures 4-5 shown, in one embodiment, at least one umbrella-shaped nozzle 252 includes a first umbrella-shaped nozzle 2521 and a second umbrella-shaped nozzle 2522. When the second injection channel 22 of the first umbrella-shaped nozzle 2521 communicates with the first injection channel 21, the diversion groove of the first umbrella-shaped nozzle 2521 extends in a first direction. When the second injection channel 22 of the second umbrella-shaped nozzle 2522 communicates with the first injection channel 21, the diversion groove of the second umbrella-shaped nozzle 2522 extends in a second direction. And the first direction is different from the second direction.

[0061] In this embodiment, when the user uses the spraying device, it is not necessary to adjust the position of the spraying device, and umbrella-shaped jets in different directions can be output, improving the convenience of use. For example, if the first direction is horizontal, the jet output through the first umbrella-shaped nozzle 2521 is in the shape of an umbrella in the horizontal direction; if the second direction is vertical, the jet output through the second umbrella-shaped nozzle 2522 is in the shape of an umbrella in the vertical direction.

[0062] As Figures 1-3 shown, in one embodiment, the first spraying channel includes two or more first sub-channels arranged in sequence along the spraying direction, and the cross-sectional area of the lower-level first sub-channel is larger than that of the upper-level first sub-channel.

[0063] In one embodiment, the second spraying channel 22 includes two or more second sub-channels arranged in sequence along the spraying direction, and the cross-sectional area of the lower-level second sub-channel is smaller than that of the upper-level second sub-channel.

[0064] In this embodiment, the fluid redistributes the flow rate and velocity at each of the first sub-channels and the second sub-channels, which helps to more precisely control the spraying flow rate and velocity.

[0065] As Figures 1-3 shown, in one embodiment, the two or more first sub-channels include a first sub-channel one 211, a first sub-channel two 212, and a first sub-channel three 213 arranged in sequence along the spraying direction, and the cross-sectional area of the first sub-channel two 212 gradually increases along the spraying direction.

[0066] In one embodiment, the two or more second sub-channels include a second sub-channel one 221, a second sub-channel two 222, and a second sub-channel three 223 arranged in sequence along the spraying direction, and the cross-sectional area of the second sub-channel two 222 gradually decreases along the spraying direction.

[0067] In this embodiment, by setting the first sub-channel two 212 to enable continuous transition from the first sub-channel one 211 to the first sub-channel three 213, and setting the second sub-channel two 222 to enable continuous transition from the second sub-channel one 221 to the second sub-channel three 223, this helps the fluid to maintain a relatively stable flow state during the spraying process.

[0068] In one embodiment, the ratio of the cross-sectional area of the first sub-channel one 211 to the cross-sectional area of the first sub-channel three 213 is between 10% - 90%. Specifically, the ratio of the cross-sectional area of the first sub-channel one 211 to the cross-sectional area of the first sub-channel three 213 is between 40% - 60%. This provides a gradually transitional space for the fluid, enabling the fluid to more smoothly adapt to the change in cross-section, thereby reducing the occurrence of turbulent flow and eddy current

[0069] In one embodiment, the ratio of the cross-sectional area of the second sub-channel three 223 to the cross-sectional area of the second sub-channel one 221 is between 10% and 90%. Specifically, the ratio of the cross-sectional area of the second sub-channel three 223 to the cross-sectional area of the second sub-channel one 221 is between 40% and 60%. This causes the fluid to gradually accelerate and focus, making the finally formed jet more concentrated.

[0070] Those skilled in the art can understand that the drawings are only schematic diagrams of a preferred embodiment scenario, and the modules or processes in the drawings are not necessarily essential for implementing the present application.

[0071] Those skilled in the art can understand that the modules in the devices in the embodiment scenario can be distributed in the devices of the embodiment scenario according to the description of the embodiment scenario, or can be correspondingly changed and located in one or more devices different from the present embodiment scenario. The modules of the above embodiment scenario can be combined into one module, or further split into multiple sub-modules.

[0072] The above serial numbers of the present application are only for description and do not represent the advantages or disadvantages of the embodiment scenario.

[0073] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included within the protection scope of the present application.

Claims

1. Injection device, characterized in that, It includes a jet device body and a nozzle head. The jet device body has a delivery channel, and the nozzle head has a jet channel. The nozzle head is arranged on the jet device body, and the jet channel communicates with the delivery channel; The jet channel includes a first jet channel and a second jet channel, and the first jet channel is located between the delivery channel and the second jet channel; The cross-sectional area of one end of the first jet channel close to the delivery channel is smaller than that of one end of the first jet channel close to the second jet channel; The cross-sectional area of one end of the second jet channel close to the delivery channel is larger than that of one end of the second jet channel far from the first jet channel; 2. The injection device according to claim 1, characterized in that, The first jet channel includes two or more first sub-channels arranged in sequence along the jet direction, and the cross-sectional area of the next-level first sub-channel is larger than that of the upper-level first sub-channel; And / or, the second jet channel includes two or more second sub-channels arranged in sequence along the jet direction, and the cross-sectional area of the next-level second sub-channel is smaller than that of the upper-level second sub-channel; 3. The injection device according to claim 2, characterized in that, Two or more of the first sub-channels include a first sub-channel one, a first sub-channel two, and a first sub-channel three arranged in sequence along the jet direction, and the cross-sectional area of the first sub-channel two gradually increases along the jet direction; And / or, two or more of the second sub-channels include a second sub-channel one, a second sub-channel two, and a second sub-channel three arranged in sequence along the jet direction, and the cross-sectional area of the second sub-channel two gradually decreases along the jet direction; 4. The injection device according to claim 3, characterized in that, The ratio of the cross-sectional area of the first sub-channel one to the cross-sectional area of the first sub-channel three is between 10% and 90%; And / or, the ratio of the cross-sectional area of the second sub-channel three to the cross-sectional area of the second sub-channel one is between 10% and 90%; 5. The injection device according to claim 1, characterized in that, The nozzle head includes a base, a rotating cap, and two or more nozzles. The base is arranged on the jet device body, and the base forms the first jet channel. Each nozzle forms the second jet channel. The nozzles are arranged on the rotating cap, and the rotating cap is rotatably arranged on the base. The rotating cap is used to rotate under the action of an external force so that the first jet channel communicates with different second jet channels; 6. The injection device according to claim 5, characterized in that, Two or more of the nozzles are arranged in a circular array; Or, the rotating cap is provided with jet holes, and the jet holes and two or more of the nozzles are arranged in a circular array. The rotating cap is also used to rotate under the action of an external force so that the first jet channel communicates with the jet holes; 7. The injection device according to claim 5, characterized in that, Two or more of the nozzles include at least one columnar nozzle, and the second jet channel of the columnar nozzle communicates with the jet orifice of the columnar nozzle; And / or, two or more of the nozzles include at least one umbrella-shaped nozzle. The umbrella-shaped nozzle has a diversion groove. The jet orifice of the umbrella-shaped nozzle is located on the bottom wall of the diversion groove, and the second jet channel of the umbrella-shaped nozzle communicates with the jet orifice of the umbrella-shaped nozzle.

8. The injection device according to claim 7, characterized in that, The at least one columnar nozzle includes a first columnar nozzle and a second columnar nozzle, and a cross-sectional area of an ejection orifice of the first columnar nozzle is larger than a cross-sectional area of an ejection orifice of the second columnar nozzle; And / or, the at least one umbrella-shaped nozzle includes a first umbrella-shaped nozzle and a second umbrella-shaped nozzle. When a second ejection channel of the first umbrella-shaped nozzle communicates with the first ejection channel, a flow guiding groove of the first umbrella-shaped nozzle extends along a first direction; When a second ejection channel of the second umbrella-shaped nozzle communicates with the first ejection channel, a flow guiding groove of the second umbrella-shaped nozzle extends along a second direction; The first direction is different from the second direction.

9. The injection device according to claim 5, characterized in that, The base includes a base seat and a spray core. The base seat is arranged on the main body of the ejection device. The rotating cap is rotatably arranged on the base seat. An accommodation space is formed between the base seat and the rotating cap. The spray core is located in the accommodation space. The spray core forms the first ejection channel, and an axis of the first ejection channel deviates from an axis of the base seat.

10. The injection device according to claim 9, characterized in that, An anti-fooling structure is arranged on the spray core, and the anti-fooling structure is used to make the installation position of the spray core unique.

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